46 个非常有用的 PHP 代码片段

PHP cooljun 119℃ 0评论

在编写代码的时候有个神奇的工具总是好的!下面这里收集了 40+ PHP 代码片段,可以帮助你开发 PHP 项目。

这些 PHP 片段对于 PHP 初学者也非常有帮助,非常容易学习,让我们开始学习吧~

1. 发送 SMS

在开发 Web 或者移动应用的时候,经常会遇到需要发送 SMS 给用户,或者因为登录原因,或者是为了发送信息。下面的 PHP 代码就实现了发送 SMS 的功能。

为了使用任何的语言发送 SMS,需要一个 SMS gateway。大部分的 SMS 会提供一个 API,这里是使用 MSG91 作为 SMS gateway。

function send_sms($mobile,$msg)
 {
 $authKey = "XXXXXXXXXXX";
 date_default_timezone_set("Asia/Kolkata");
 $date = strftime("%Y-%m-%d %H:%M:%S");
 //Multiple mobiles numbers separated by comma
 $mobileNumber = $mobile;

//Sender ID,While using route4 sender id should be 6 characters long.
 $senderId = "IKOONK";

//Your message to send, Add URL encoding here.
 $message = urlencode($msg);

//Define route
 $route = "template";
 //Prepare you post parameters
 $postData = array(
 'authkey' => $authKey,
 'mobiles' => $mobileNumber,
 'message' => $message,
 'sender' => $senderId,
 'route' => $route
 );

//API URL
 $url="https://control.msg91.com/sendhttp.php";

// init the resource
 $ch = curl_init();
 curl_setopt_array($ch, array(
 CURLOPT_URL => $url,
 CURLOPT_RETURNTRANSFER => true,
 CURLOPT_POST => true,
 CURLOPT_POSTFIELDS => $postData
 //,CURLOPT_FOLLOWLOCATION => true
 ));

//Ignore SSL certificate verification
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

//get response
 $output = curl_exec($ch);
 //Print error if any
 if(curl_errno($ch))
 {
 echo 'error:' . curl_error($ch);
 }

curl_close($ch);
 }

其中“$authKey = “XXXXXXXXXXX”;”需要你输入你的密码,“$senderId = “IKOONK”;”需要你输入你的 SenderID。当输入移动号码的时候需要指定国家代码 (比如,美国是 1,印度是 91 )。

语法:

<?php
$message = "Hello World";
$mobile = "918112998787";
send_sms($mobile,$message);
?>

2. 使用 mandrill 发送邮件

Mandrill 是一款强大的 SMTP 提供器。开发者倾向于使用一个第三方 SMTP provider 来获取更好的收件交付。

下面的函数中,你需要把 “Mandrill.php” 放在同一个文件夹,作为 PHP 文件,这样就可以使用TA来发送邮件。

function send_email($to_email,$subject,$message1)
{
require_once 'Mandrill.php';
$apikey = 'XXXXXXXXXX'; //specify your api key here
$mandrill = new Mandrill($apikey);

$message = new stdClass();
$message->html = $message1;
$message->text = $message1;
$message->subject = $subject;
$message->from_email = "blog@koonk.com";//Sender Email
$message->from_name  = "KOONK";//Sender Name
$message->to = array(array("email" => $to_email));
$message->track_opens = true;

$response = $mandrill->messages->send($message);
}

“$apikey = 'XXXXXXXXXX'; //specify your api key here”这里需要你指定你的 API 密钥(从 Mandrill 账户中获得)。

语法:

<?php
$to = "abc@example.com";
$subject = "This is a test email";
$message = "Hello World!";
send_email($to,$subject,$message);
?>

为了达到最好的效果,最好按照 Mandrill 的教程去配置 DNS。

3. PHP 函数:阻止 SQL 注入

SQL 注入或者 SQLi 常见的攻击网站的手段,使用下面的代码可以帮助你防止这些工具。

function clean($input)
{
if (is_array($input))
{
foreach ($input as $key => $val)
{
$output[$key] = clean($val);
// $output[$key] = $this->clean($val);
}
}
else
{
$output = (string) $input;
// if magic quotes is on then use strip slashes
if (get_magic_quotes_gpc())
{
$output = stripslashes($output);
}
// $output = strip_tags($output);
$output = htmlentities($output, ENT_QUOTES, 'UTF-8');
}
// return the clean text
return $output;
}

语法:

<?php
$text = "<script>alert(1)</script>";
$text = clean($text);
echo $text;
?>

4. 检测用户位置

使用下面的函数,可以检测用户是在哪个城市访问你的网站

function detect_city($ip) {

$default = 'UNKNOWN';

$curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';

$url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);
$ch = curl_init();

$curl_opt = array(
CURLOPT_FOLLOWLOCATION  => 1,
CURLOPT_HEADER      => 0,
CURLOPT_RETURNTRANSFER  => 1,
CURLOPT_USERAGENT   => $curlopt_useragent,
CURLOPT_URL       => $url,
CURLOPT_TIMEOUT         => 1,
CURLOPT_REFERER         => 'http://' . $_SERVER['HTTP_HOST'],
);

curl_setopt_array($ch, $curl_opt);

$content = curl_exec($ch);

if (!is_null($curl_info)) {
$curl_info = curl_getinfo($ch);
}

curl_close($ch);

if ( preg_match('{<li>City : ([^<]*)</li>}i', $content, $regs) )  {
$city = $regs[1];
}
if ( preg_match('{<li>State/Province : ([^<]*)</li>}i', $content, $regs) )  {
$state = $regs[1];
}

if( $city!='' && $state!='' ){
$location = $city . ', ' . $state;
return $location;
}else{
return $default;
}

}

语法:

<?php
$ip = $_SERVER['REMOTE_ADDR'];
$city = detect_city($ip);
echo $city;
?>

5. 获取 Web 页面的源代码

使用下面的函数,可以获取任意 Web 页面的 HTML 代码

function display_sourcecode($url)
{
$lines = file($url);
$output = "";
foreach ($lines as $line_num => $line) {
// loop thru each line and prepend line numbers
$output.= "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br>\n";
}
}

语法:

<?php
$url = "http://blog.koonk.com";
$source = display_sourcecode($url);
echo $source;
?>

6. 计算喜欢你的 Facebook 页面的用户

<?php
function fb_fan_count($facebook_name)
{
    $data = json_decode(file_get_contents("https://graph.facebook.com/" . $facebook_name));
    $likes = $data->likes;
    return $likes;
}

语法:

<?php
$page = "koonktechnologies";
$count = fb_fan_count($page);
echo $count;
?>

7. 确定任意图片的主导颜色

function dominant_color($image)
{
$i = imagecreatefromjpeg($image);
for ($x=0;$x<imagesx($i);$x++) {
for ($y=0;$y<imagesy($i);$y++) {
$rgb = imagecolorat($i,$x,$y);
$r   = ($rgb >> 16) & 0xFF;
$g   = ($rgb >>  & 0xFF;
$b   = $rgb & 0xFF;
$rTotal += $r;
$gTotal += $g;
$bTotal += $b;
$total++;
}
}
$rAverage = round($rTotal/$total);
$gAverage = round($gTotal/$total);
$bAverage = round($bTotal/$total);
}

8. whois 查询

使用下面的函数可以获取任何域名用户的完整细节

function whois_query($domain) {

// fix the domain name:
$domain = strtolower(trim($domain));
$domain = preg_replace('/^http:\/\//i', '', $domain);
$domain = preg_replace('/^www\./i', '', $domain);
$domain = explode('/', $domain);
$domain = trim($domain[0]);

// split the TLD from domain name
$_domain = explode('.', $domain);
$lst = count($_domain)-1;
$ext = $_domain[$lst];

// You find resources and lists
// like these on wikipedia:
//
// http://de.wikipedia.org/wiki/Whois
//
$servers = array(
"biz" => "whois.neulevel.biz",
"com" => "whois.internic.net",
"us" => "whois.nic.us",
"coop" => "whois.nic.coop",
"info" => "whois.nic.info",
"name" => "whois.nic.name",
"net" => "whois.internic.net",
"gov" => "whois.nic.gov",
"edu" => "whois.internic.net",
"mil" => "rs.internic.net",
"int" => "whois.iana.org",
"ac" => "whois.nic.ac",
"ae" => "whois.uaenic.ae",
"at" => "whois.ripe.net",
"au" => "whois.aunic.net",
"be" => "whois.dns.be",
"bg" => "whois.ripe.net",
"br" => "whois.registro.br",
"bz" => "whois.belizenic.bz",
"ca" => "whois.cira.ca",
"cc" => "whois.nic.cc",
"ch" => "whois.nic.ch",
"cl" => "whois.nic.cl",
"cn" => "whois.cnnic.net.cn",
"cz" => "whois.nic.cz",
"de" => "whois.nic.de",
"fr" => "whois.nic.fr",
"hu" => "whois.nic.hu",
"ie" => "whois.domainregistry.ie",
"il" => "whois.isoc.org.il",
"in" => "whois.ncst.ernet.in",
"ir" => "whois.nic.ir",
"mc" => "whois.ripe.net",
"to" => "whois.tonic.to",
"tv" => "whois.tv",
"ru" => "whois.ripn.net",
"org" => "whois.pir.org",
"aero" => "whois.information.aero",
"nl" => "whois.domain-registry.nl"
);

if (!isset($servers[$ext])){
die('Error: No matching nic server found!');
}

$nic_server = $servers[$ext];

$output = '';

// connect to whois server:
if ($conn = fsockopen ($nic_server, 43)) {
fputs($conn, $domain."\r\n");
while(!feof($conn)) {
$output .= fgets($conn,128);
}
fclose($conn);
}
else { die('Error: Could not connect to ' . $nic_server . '!'); }

return $output;
}

语法:

<?php
$domain = "http://www.blog.koonk.com";
$result = whois_query($domain);
print_r($result);
?>

9. 验证邮箱地址

有时候,当在网站填写表单,用户可能会输入错误的邮箱地址,这个函数可以验证邮箱地址是否有效。

function is_validemail($email)
{
$check = 0;
if(filter_var($email,FILTER_VALIDATE_EMAIL))
{
$check = 1;
}
return $check;
}

语法:

<?php
$email = "blog@koonk.com";
$check = is_validemail($email);
echo $check;
// If the output is 1, then email is valid.
?>

10. 获取用户的真实 IP

function getRealIpAddr()
{
if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))
{
$ip=$_SERVER['HTTP_CLIENT_IP'];
}
elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))
//to check ip is pass from proxy
{
$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}
else
{
$ip=$_SERVER['REMOTE_ADDR'];
}
return $ip;
}

语法:

<?php
$ip = getRealIpAddr();
echo $ip;
?>

11. 转换 URL:从字符串变成超链接

如果你正在开发论坛,博客或者是一个常规的表单提交,很多时候都要用户访问一个网站。使用这个函数,URL 字符串就可以自动的转换为超链接。

function makeClickableLinks($text)
{
$text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)',
'<a href="\1">\1</a>', $text);
$text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)',
'\1<a href="http://\2">\2</a>', $text);
$text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})',
'<a href="mailto:\1">\1</a>', $text);

return $text;
}

语法:

<?php
$text = "This is my first post on http://blog.koonk.com";
$text = makeClickableLinks($text);
echo $text;
?>

12. 阻止多个 IP 访问你的网站

这个代码片段可以方便你禁止某些特定的 IP 地址访问你的网站

if ( !file_exists('blocked_ips.txt') ) {
$deny_ips = array(
'127.0.0.1',
'192.168.1.1',
'83.76.27.9',
'192.168.1.163'
);
} else {
$deny_ips = file('blocked_ips.txt');
}
// read user ip adress:
$ip = isset($_SERVER['REMOTE_ADDR']) ? trim($_SERVER['REMOTE_ADDR']) : '';

// search current IP in $deny_ips array
if ( (array_search($ip, $deny_ips))!== FALSE ) {
// address is blocked:
echo 'Your IP adress ('.$ip.') was blocked!';
exit;
}

13. 强制性文件下载

如果你需要下载特定的文件而不用另开新窗口,下面的代码片段可以帮助你。

function force_download($file)
 {
 $dir      = "../log/exports/";
 if ((isset($file))&&(file_exists($dir.$file))) {
 header("Content-type: application/force-download");
 header('Content-Disposition: inline; filename="' . $dir.$file . '"');
 header("Content-Transfer-Encoding: Binary");
 header("Content-length: ".filesize($dir.$file));
 header('Content-Type: application/octet-stream');
 header('Content-Disposition: attachment; filename="' . $file . '"');
 readfile("$dir$file");
 } else {
 echo "No file selected";
 }
 }

语法:

<php
 force_download("image.jpg");
 ?>

14. 创建 JSON 数据

使用下面的 PHP 片段可以创建 JSON 数据,可以方便你创建移动应用的 Web 服务

$json_data = array ('id'=>1,'name'=>"Mohit");
 echo json_encode($json_data);

15. 压缩 zip 文件

使用下面的 PHP 片段可以即时压缩 zip 文件

<?php
function create_zip($files = array(), $destination = '', $overwrite = false)
{
    //if the zip file already exists and overwrite is false, return false
    if (file_exists($destination) && !$overwrite) {
        return false;
    }
    //vars
    $valid_files = array();
    //if files were passed in...
    if (is_array($files)) {
        //cycle through each file
        foreach ($files as $file) {
            //make sure the file exists
            if (file_exists($file)) {
                $valid_files[] = $file;
            }
        }
    }
    //if we have good files...
    if (count($valid_files)) {
        //create the archive
        $zip = new ZipArchive();
        if ($zip->open($destination, $overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
            return false;
        }
        //add the files
        foreach ($valid_files as $file) {
            $zip->addFile($file, $file);
        }
        //debug
        //echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status;
        //close the zip -- done!
        $zip->close();
        //check to make sure the file exists
        return file_exists($destination);
    } else {
        return false;
    }
}

语法:

<?php
 $files=array('file1.jpg', 'file2.jpg', 'file3.gif');
 create_zip($files, 'myzipfile.zip', true);
 ?>

16. 解压文件

<?php
function unzip($location, $newLocation)
{
    if (exec("unzip {$location}", $arr)) {
        mkdir($newLocation);
        for ($i = 1; $i < count($arr); $i++) {
            $file = trim(preg_replace("~inflating: ~", "", $arr[$i]));
            copy($location . '/' . $file, $newLocation . '/' . $file);
            unlink($location . '/' . $file);
        }
        return TRUE;
    } else {
        return FALSE;
    }
}

语法:

<?php
 unzip('test.zip','unziped/test'); //File would be unzipped in unziped/test folder
 ?>

17. 缩放图片

<?php
function resize_image($filename, $tmpname, $xmax, $ymax)
{
    $ext = explode(".", $filename);
    $ext = $ext[count($ext) - 1];
    if ($ext == "jpg" || $ext == "jpeg") {
        $im = imagecreatefromjpeg($tmpname);
    } elseif ($ext == "png") {
        $im = imagecreatefrompng($tmpname);
    } elseif ($ext == "gif") {
        $im = imagecreatefromgif($tmpname);
    }
    $x = imagesx($im);
    $y = imagesy($im);
    if ($x <= $xmax && $y <= $ymax) {
        return $im;
    }
    if ($x >= $y) {
        $newx = $xmax;
        $newy = $newx * $y / $x;
    } else {
        $newy = $ymax;
        $newx = $x / $y * $newy;
    }
    $im2 = imagecreatetruecolor($newx, $newy);
    imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);
    return $im2;
}

18. 使用 mail() 发送邮件

之前我们提供了如何使用 Mandrill 发送邮件的 PHP 代码片段,但是如果你不想使用第三方服务,那么可以使用下面的 PHP 代码片段。

function send_mail($to,$subject,$body)
 {
 $headers = "From: KOONK\r\n";
 $headers .= "Reply-To: blog@koonk.com\r\n";
 $headers .= "Return-Path: blog@koonk.com\r\n";
 $headers .= "X-Mailer: PHP5\n";
 $headers .= 'MIME-Version: 1.0' . "\n";
 $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
 mail($to,$subject,$body,$headers);
 }

语法:

<?php
 $to = "admin@koonk.com";
 $subject = "This is a test mail";
 $body = "Hello World!";
 send_mail($to,$subject,$body);
 ?>

19. 把秒转换成天数,小时数和分钟

function secsToStr($secs) {
 if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days.' day';if($days<>1){$r.='s';}if($secs>0){$r.=', ';}}
 if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours.' hour';if($hours<>1){$r.='s';}if($secs>0){$r.=', ';}}
 if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes.' minute';if($minutes<>1){$r.='s';}if($secs>0){$r.=', ';}}
 $r.=$secs.' second';if($secs<>1){$r.='s';}
 return $r;
 }

语法:

<?php
 $seconds = "56789";
 $output = secsToStr($seconds);
 echo $output;
 ?>

20. 数据库连接

连接 MySQL 数据库

<?php
$DBNAME = 'koonk';
$HOST = 'localhost';
$DBUSER = 'root';
$DBPASS = 'koonk';
$CONNECT = mysql_connect($HOST, $DBUSER, $DBPASS);
if (!$CONNECT) {
    echo 'MySQL Error: ' . mysql_error();
}
$SELECT = mysql_select_db($DBNAME);
if (!$SELECT) {
    echo 'MySQL Error: ' . mysql_error();
}

21. 目录清单

使用下面的 PHP 代码片段可以在一个目录中列出所有文件和文件夹

<?php
function list_files($dir)
{
    if(is_dir($dir))
    {
        if($handle = opendir($dir))
        {
            while(($file = readdir($handle)) !== false)
            {
                if($file != "." &amp;&amp; $file != ".." &amp;&amp; $file != "Thumbs.db"/*pesky windows, images..*/)
                {
                    echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."\n";
                }
                closedir($handle);
            }
        }
    }
}

语法:

<?php
 list_files("images/"); //This will list all files of images folder
 ?>

22. 检测用户语言

使用下面的 PHP 代码片段可以检测用户浏览器所使用的语言

function get_client_language($availableLanguages, $default = 'en')
{
    if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
        $langs = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
        foreach ($langs as $value) {
            $choice = substr($value, 0, 2);
            if (in_array($choice, $availableLanguages)) {
                return $choice;
            }
        }
    }
    return $default;
}

23. 查看 CSV 文件

<?php
function readCSV($csvFile)
{
    $file_handle = fopen($csvFile, 'r');
    while (!feof($file_handle)) {
        $line_of_text[] = fgetcsv($file_handle, 1024);
    }
    fclose($file_handle);
    return $line_of_text;
}

语法:

<?php
 $csvFile = "test.csv";
 $csv = readCSV($csvFile);
 $a = csv[0][0]; // This will get value of Column 1 & Row 1
 ?>

24. 从 PHP 数据创建 CSV 文件

function generateCsv($data, $delimiter = ',', $enclosure = '"') {
 $handle = fopen('php://temp', 'r+');
 foreach ($data as $line) {
 fputcsv($handle, $line, $delimiter, $enclosure);
 }
 rewind($handle);
 while (!feof($handle)) {
 $contents .= fread($handle, 8192);
 }
 fclose($handle);
 return $contents;
 }

语法:

<?php
 $data[0] = "apple";
 $data[1] = "oranges";
 generateCsv($data, $delimiter = ',', $enclosure = '"');
 ?>

25. 解析 XML 数据

$xml_string = "<?xml version='1.0'?>\r\n<moleculedb>\r\n<molecule name='Benzine'>\r\n<symbol>ben</symbol>\r\n<code>A</code>\r\n</molecule>\r\n<molecule name='Water'>\r\n<symbol>h2o</symbol>\r\n<code>K</code>\r\n</molecule>\r\n</moleculedb>";
//load the xml string using simplexml function
$xml = simplexml_load_string($xml_string);
//loop through the each node of molecule
foreach ($xml->molecule as $record) {
    //attribute are accessted by
    echo $record['name'], '  ';
    //node are accessted by -> operator
    echo $record->symbol, '  ';
    echo $record->code, '<br />';
}

26. 解析 JSON 数据

$json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ';
 $obj=json_decode($json_string);
 //print the parsed data
 echo $obj->name; //displays rolf
 echo $obj->office[0]; //displays google

27. 获取当前页面 URL

这个 PHP 片段可以帮助你让用户登录后直接跳转到之前浏览的页面

function current_url()
 {
 $url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
 $validURL = str_replace("&", "&amp;", $url);
 return validURL;
 }

语法:

<?php
 echo "Currently you are on: ".current_url();
 ?>

28. 从任意的 Twitter 账号获取最新的 Tweet

<?php
function my_twitter($username)
{
    $no_of_tweets = 1;
    $feed = "http://search.twitter.com/search.atom?q=from:" . $username . "&rpp=" . $no_of_tweets;
    $xml = simplexml_load_file($feed);
    foreach ($xml->children() as $child) {
        foreach ($child as $value) {
            if ($value->getName() == "link") {
                $link = $value['href'];
            }
            if ($value->getName() == "content") {
                $content = $value . "";
                echo '<p class="twit">' . $content . ' <a class="twt" href="' . $link . '" title="">&nbsp; </a></p>';
            }
        }
    }
}

语法:

<?php
 $handle = "koonktech";
 my_twitter($handle);
 ?>

29. 转发数量

使用这个 PHP 片段可以检测你的页面 URL 有多少转发数量

function tweetCount($url)
{
    $content = file_get_contents("http://api.tweetmeme.com/url_info?url=" . $url);
    $element = new SimpleXmlElement($content);
    $retweets = $element->story->url_count;
    if ($retweets) {
        return $retweets;
    } else {
        return 0;
    }
}

语法:

<?php
 $url = "http://blog.koonk.com";
 $count = tweetCount($url);
 return $count;
 ?>

30. 计算两个日期的差

<?php
$date1 = date('Y-m-d');
$date2 = "2015-12-04";
$diff = abs(strtotime($date2) - strtotime($date1));
$years = floor($diff / (365 * 60 * 60 * 24));
$months = floor(($diff - $years * 365 * 60 * 60 * 24) / (30 * 60 * 60 * 24));
$days = floor(($diff - $years * 365 * 60 * 60 * 24 - $months * 30 * 60 * 60 * 24) / (60 * 60 * 24));
printf("%d years, %d months, %d days\n", $years, $months, $days);
//-------------------------------------------------------- OR
$date1 = new DateTime("2007-03-24");
$date2 = new DateTime("2009-06-26");
$interval = $date1->diff($date2);
echo "difference " . $interval->y . " years, " . $interval->m . " months, " . $interval->d . " days ";
// shows the total amount of days (not divided into years, months and days like above)
echo "difference " . $interval->days . " days ";
//-------------------------------------------------------- OR
/**
* Calculate differences between two dates with precise semantics. Based on PHPs DateTime::diff()
* implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved.
*
* See here for original code:
* http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view=markup
* http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view=markup
*/
function _date_range_limit($start, $end, $adj, $a, $b, $result)
{
    if ($result[$a] < $start) {
        $result[$b] -= intval(($start - $result[$a] - 1) / $adj) + 1;
        $result[$a] += $adj * intval(($start - $result[$a] - 1) / $adj + 1);
    }
    if ($result[$a] >= $end) {
        $result[$b] += intval($result[$a] / $adj);
        $result[$a] -= $adj * intval($result[$a] / $adj);
    }
    return $result;
}
function _date_range_limit_days($base, $result)
{
    $days_in_month_leap = array(31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    $days_in_month = array(31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    _date_range_limit(1, 13, 12, "m", "y", &$base);
    $year = $base["y"];
    $month = $base["m"];
    if (!$result["invert"]) {
        while ($result["d"] < 0) {
            $month--;
            if ($month < 1) {
                $month += 12;
                $year--;
            }
            $leapyear = $year % 400 == 0 || $year % 100 != 0 && $year % 4 == 0;
            $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
            $result["d"] += $days;
            $result["m"]--;
        }
    } else {
        while ($result["d"] < 0) {
            $leapyear = $year % 400 == 0 || $year % 100 != 0 && $year % 4 == 0;
            $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
            $result["d"] += $days;
            $result["m"]--;
            $month++;
            if ($month > 12) {
                $month -= 12;
                $year++;
            }
        }
    }
    return $result;
}
function _date_normalize($base, $result)
{
    $result = _date_range_limit(0, 60, 60, "s", "i", $result);
    $result = _date_range_limit(0, 60, 60, "i", "h", $result);
    $result = _date_range_limit(0, 24, 24, "h", "d", $result);
    $result = _date_range_limit(0, 12, 12, "m", "y", $result);
    $result = _date_range_limit_days(&$base, &$result);
    $result = _date_range_limit(0, 12, 12, "m", "y", $result);
    return $result;
}
/**
* Accepts two unix timestamps.
*/
function _date_diff($one, $two)
{
    $invert = false;
    if ($one > $two) {
        list($one, $two) = array($two, $one);
        $invert = true;
    }
    $key = array("y", "m", "d", "h", "i", "s");
    $a = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $one))));
    $b = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $two))));
    $result = array();
    $result["y"] = $b["y"] - $a["y"];
    $result["m"] = $b["m"] - $a["m"];
    $result["d"] = $b["d"] - $a["d"];
    $result["h"] = $b["h"] - $a["h"];
    $result["i"] = $b["i"] - $a["i"];
    $result["s"] = $b["s"] - $a["s"];
    $result["invert"] = $invert ? 1 : 0;
    $result["days"] = intval(abs(($one - $two) / 86400));
    if ($invert) {
        _date_normalize(&$a, &$result);
    } else {
        _date_normalize(&$b, &$result);
    }
    return $result;
}
$date = "2014-12-04 19:37:22";
echo '<pre>';
print_r(_date_diff(strtotime($date), time()));
echo '</pre>';

31. 删除文件夹内容

<?php
function Delete($path)
{
    if (is_dir($path) === true) {
        $files = array_diff(scandir($path), array('.', '..'));
        foreach ($files as $file) {
            Delete(realpath($path) . '/' . $file);
        }
        return rmdir($path);
    } else {
        if (is_file($path) === true) {
            return unlink($path);
        }
    }
    return false;
}

语法:

<?php
 $path = "images/";
 Delete($path); // This will delete images folder along with its contents.
 ?>

32. 搜索和高亮字符串中的关键字

<?php
function highlighter_text($text, $words)
{
    $split_words = explode(" ", $words);
    foreach ($split_words as $word) {
        $color = "#4285F4";
        $text = preg_replace("|({$word})|Ui", "<span style=\"color:" . $color . ";\"><b>\$1</b></span>", $text);
    }
    return $text;
}

语法:

<?php
 $string = "I like chocolates and I like apples";
 $words = "apple";
 echo highlighter_text($string ,$words);
 ?>

33. 写入文件

<?
 $filename = 'blog.csv';
 $fp = fopen($filename, 'w');
 $output = " Hello ";
 $output .= " World! ";
 $output .= "\r\n";
 fputs($fp, $output);
 fclose($fp);
 ?>

34. 根据 URL 下载图片

<?php
function imagefromURL($image, $rename)
{
    $ch = curl_init($image);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
    $rawdata = curl_exec($ch);
    curl_close($ch);
    $fp = fopen("{$rename}", 'w');
    fwrite($fp, $rawdata);
    fclose($fp);
}

语法:

<?php
 $url = "http://koonk.com/images/logo.png";
 $rename = "koonk.png";
 imagefromURL($url,$rename);
 ?>

35. 检测 URL 是否有效

<?php
function isvalidURL($url)
{
    $check = 0;
    if (filter_var($url, FILTER_VALIDATE_URL) !== false) {
        $check = 1;
    }
    return $check;
}

语法:

<?php
 $url = "http://koonk.com";
 $check = checkvalidURL($url);
 echo $check; //if returns 1 then URL is valid.
 ?>

36. 生成二维码

<?php
function qr_code($data, $type = "TXT", $size = '150', $ec = 'L', $margin = '0')
{
    $types = array("URL" => "http://", "TEL" => "TEL:", "TXT" => "", "EMAIL" => "MAILTO:");
    if (!in_array($type, array("URL", "TEL", "TXT", "EMAIL"))) {
        $type = "TXT";
    }
    if (!preg_match('/^' . $types[$type] . '/', $data)) {
        $data = str_replace("\\", "", $types[$type]) . $data;
    }
    $ch = curl_init();
    $data = urlencode($data);
    curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart');
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs=' . $size . 'x' . $size . '&cht=qr&chld=' . $ec . '|' . $margin . '&chl=' . $data);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    $response = curl_exec($ch);
    curl_close($ch);
    return $response;
}

语法:

<?php
 header("Content-type: image/png");
 echo qr_code("http://koonk.com", "URL");
 ?>

37. 计算两个地图坐标之间的距离

function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {
 $theta = $longitude1 - $longitude2;
 $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
 $miles = acos($miles);
 $miles = rad2deg($miles);
 $miles = $miles * 60 * 1.1515;
 $feet = $miles * 5280;
 $yards = $feet / 3;
 $kilometers = $miles * 1.609344;
 $meters = $kilometers * 1000;
 return compact('miles','feet','yards','kilometers','meters');
 }

语法:

<?php
 $point1 = array('lat' => 40.770623, 'long' => -73.964367);
 $point2 = array('lat' => 40.758224, 'long' => -73.917404);
 $distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
 foreach ($distance as $unit => $value) {
 echo $unit.': '.number_format($value,4).'<br />';
 }
 ?>

38. 获取一个特定话题标签的所有 Tweets

<?php
function getTweets($hash_tag)
{
    $url = 'http://search.twitter.com/search.atom?q=' . urlencode($hash_tag);
    echo "<p>Connecting to <strong>{$url}</strong> ...</p>";
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
    $xml = curl_exec($ch);
    curl_close($ch);
    //If you want to see the response from Twitter, uncomment this next part out:
    //echo "<p>Response:</p>";
    //echo "<pre>".htmlspecialchars($xml)."</pre>";
    $affected = 0;
    $twelement = new SimpleXMLElement($xml);
    foreach ($twelement->entry as $entry) {
        $text = trim($entry->title);
        $author = trim($entry->author->name);
        $time = strtotime($entry->published);
        $id = $entry->id;
        echo "<p>Tweet from " . $author . ": <strong>" . $text . "</strong>  <em>Posted " . date('n/j/y g:i a', $time) . "</em></p>";
    }
    return true;
}

39. 添加 th,st,nd 或者 rd 作为数字的后缀

Friday the 13th

<?php
function ordinal($cdnl)
{
    $test_c = abs($cdnl) % 10;
    $ext = abs($cdnl) % 100 < 21 && abs($cdnl) % 100 > 4 ? 'th' : ($test_c < 4 ? $test_c < 3 ? $test_c < 2 ? $test_c < 1 ? 'th' : 'st' : 'nd' : 'rd' : 'th');
    return $cdnl . $ext;
}

语法:

<?php
 $number = 10;
 echo ordinal($number); //output is 10th
 ?>

40. 限制文件下载的速度

<?php
// local file that should be send to the client
$local_file = 'test-file.zip';
// filename that the user gets as default
$download_file = 'your-download-name.zip';
// set the download rate limit (=> 20,5 kb/s)
$download_rate = 20.5;
if (file_exists($local_file) && is_file($local_file)) {
    // send headers
    header('Cache-control: private');
    header('Content-Type: application/octet-stream');
    header('Content-Length: ' . filesize($local_file));
    header('Content-Disposition: filename=' . $download_file);
    // flush content
    flush();
    // open file stream
    $file = fopen($local_file, "r");
    while (!feof($file)) {
        // send the current file part to the browser
        print fread($file, round($download_rate * 1024));
        // flush the content to the browser
        flush();
        // sleep one second
        sleep(1);
    }
    // close file stream
    fclose($file);
} else {
    die('Error: The file ' . $local_file . ' does not exist!');
}

41. 把文本转换成图片

<?php
header("Content-type: image/png");
$string = $_GET['text'];
$im = imagecreatefrompng("images/button.png");
$color = imagecolorallocate($im, 255, 255, 255);
$px = (imagesx($im) - 7.5 * strlen($string)) / 2;
$py = 9;
$fontSize = 1;
imagestring($im, fontSize, $px, $py, $string, $color);
imagepng($im);
imagedestroy($im);

42. 获取远程文件的大小

<?php
function remote_filesize($url, $user = "", $pw = "")
{
    ob_start();
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    if (!empty($user) && !empty($pw)) {
        $headers = array('Authorization: Basic ' . base64_encode("{$user}:{$pw}"));
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    }
    $ok = curl_exec($ch);
    curl_close($ch);
    $head = ob_get_contents();
    ob_end_clean();
    $regex = '/Content-Length:\\s([0-9].+?)\\s/';
    $count = preg_match($regex, $head, $matches);
    return isset($matches[1]) ? $matches[1] : "unknown";
}

语法:

<?php
 $file = "http://koonk.com/images/logo.png";
 $size = remote_filesize($url);
 echo $size;
 ?>

43. 使用 imagebrick 进行 pdf 到图像的转换

<?php
$pdf_file = './pdf/demo.pdf';
$save_to = './jpg/demo.jpg';
//make sure that apache has permissions to write in this folder! (common problem)
//execute ImageMagick command 'convert' and convert PDF to JPG with applied settings
exec('convert "' . $pdf_file . '" -colorspace RGB -resize 800 "' . $save_to . '"', $output, $return_var);
if ($return_var == 0) {
    //if exec successfuly converted pdf to jpg
    print "Conversion OK";
} else {
    print "Conversion failed.<br />" . $output;
}

44. 使用 tinyurl 生成短网址

function get_tiny_url($url)
 {
 $ch = curl_init();
 $timeout = 5;
 curl_setopt($ch,CURLOPT_URL,'http://tinyurl.com/api-create.php?url='.$url);
 curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
 curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
 $data = curl_exec($ch);
 curl_close($ch);
 return $data;
 }

语法:

<?php
 $url = "http://blog.koonk.com/2015/07/Hello-World";
 $tinyurl = get_tiny_url($url);
 echo $tinyurl;
 ?>

45. youtube 下载链接生成器

使用下面的 PHP 片段可以让你的用户下载 Youtube 视频

<?php
function str_between($string, $start, $end)
{
    $string = " " . $string;
    $ini = strpos($string, $start);
    if ($ini == 0) {
        return "";
    }
    $ini += strlen($start);
    $len = strpos($string, $end, $ini) - $ini;
    return substr($string, $ini, $len);
}
function get_youtube_download_link()
{
    $youtube_link = $_GET['youtube'];
    $youtube_page = file_get_contents($youtube_link);
    $v_id = str_between($youtube_page, "&video_id=", "&");
    $t_id = str_between($youtube_page, "&t=", "&");
    $flv_link = "http://www.youtube.com/get_video?video_id={$v_id}&t={$t_id}";
    $hq_flv_link = "http://www.youtube.com/get_video?video_id={$v_id}&t={$t_id}&fmt=6";
    $mp4_link = "http://www.youtube.com/get_video?video_id={$v_id}&t={$t_id}&fmt=18";
    $threegp_link = "http://www.youtube.com/get_video?video_id={$v_id}&t={$t_id}&fmt=17";
    echo "\t\tDownload (right-click &gt; save as)&#58;\n\t\t";
    echo "<a href=\"{$flv_link}\">FLV</a>\n\t\t";
    echo "<a href=\"{$hq_flv_link}\">HQ FLV (if available)</a>\n\t\t";
    echo "<a href=\"{$mp4_link}\">MP4</a>\n\t\t";
    echo "<a href=\"{$threegp_link}\">3GP</a><br><br>\n";
}

46. Facebook 样式的时间戳

Facebook (x mins age, y hours ago etc)

<?php
function nicetime($date)
{
    if (empty($date)) {
        return "No date provided";
    }
    $periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
    $lengths = array("60", "60", "24", "7", "4.35", "12", "10");
    $now = time();
    $unix_date = strtotime($date);
    // check validity of date
    if (empty($unix_date)) {
        return "Bad date";
    }
    // is it future date or past date
    if ($now > $unix_date) {
        $difference = $now - $unix_date;
        $tense = "ago";
    } else {
        $difference = $unix_date - $now;
        $tense = "from now";
    }
    for ($j = 0; $difference >= $lengths[$j] && $j < count($lengths) - 1; $j++) {
        $difference /= $lengths[$j];
    }
    $difference = round($difference);
    if ($difference != 1) {
        $periods[$j] .= "s";
    }
    return "{$difference} {$periods[$j]} {$tense}";
}

语法:

<?php
 $date = "2015-07-05 03:45";
 $result = nicetime($date); // 2 days ago
 ?>

via blog.koonk.com

转载请注明:cooljun小站 » 46 个非常有用的 PHP 代码片段

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