直接拿来用，10个，9个PHP代码片段（不断更新~~）

还记得CSDN研发频道此前发表过的一篇《可以直接拿来用的15个jQuery代码片段》吗？本文笔者将继续为你奉上10个超级有用的PHP代码片段。

PHP是一种HTML内嵌式的语言，是一种在服务器端执行的嵌入HTML文档的脚本语言。PHP拥有数以百计的基本功能，支持上千种扩展。这些功能都被很好的加载在PHP站点上，但内置的库有各种各样的命名。在PHP代码库中包含了无数个有用的PHP代码片段，每位开发者都需要不断完善自己的“工具箱”。有了这些代码片段可以为你节省大量的时间，一起来看下。

1.查找Longitudes与Latitudes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 = $kilometers * 1000;    return compact('miles','feet','yards','kilometers','meters'); }$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).'';}The example returns the following:miles: 2.6025feet: 13,741.4350yards: 4,580.4783kilometers: 4.1884meters: 4,188.3894

2.完善cURL功能

function xcurl($url,$ref=null,$post=array(),$ua="Mozilla/5.0 (X11; Linux x86_64; rv:2.2a1pre) Gecko/20110324 Firefox/4.2a1pre",$print=false) {$ch = curl_init();curl_setopt($ch, CURLOPT_AUTOREFERER, true);if(!empty($ref)) {curl_setopt($ch, CURLOPT_REFERER, $ref);}curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_HEADER, 0);curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);if(!empty($ua)) {curl_setopt($ch, CURLOPT_USERAGENT, $ua);}if(count($post) > 0){curl_setopt($ch, CURLOPT_POST, 1);curl_setopt($ch, CURLOPT_POSTFIELDS, $post);}$output = curl_exec($ch);curl_close($ch);if($print) {print($output);} else {return $output;}}

3.清理用户输入

]*?>.*?@si',   // Strip out javascript    '@<[\/\!]*?[^<>]*?>@si',            // Strip out HTML tags    '@]*?>.*?@siU',    // Strip style tags properly    '@@'         // Strip multi-line comments  );    $output = preg_replace($search, '', $input);    return $output;  }?>$val) {            $output[$var] = sanitize($val);        }    }    else {        if (get_magic_quotes_gpc()) {            $input = stripslashes($input);        }        $input  = cleanInput($input);        $output = mysql_real_escape_string($input);    }    return $output;}?>

4.通过IP（城市、国家）检测地理位置

function detect_city($ip) {        $default = 'Hollywood, CA';        if (!is_string($ip) || strlen($ip) < 1 || $ip == '127.0.0.1' || $ip == 'localhost')             $ip = '8.8.8.8';           $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('{City : ([^<]*)}i', $content, $regs) ) { $city = $regs[1]; } if ( preg_match('{State/Province : ([^<]*)}i', $content, $regs) ) { $state = $regs[1]; } if( $city!='' && $state!='' ){ $location = $city . ', ' . $state; return $location; }else{ return $default; } }

5.设置密码强度

var_dump(password_strength("Correct Horse Battery Staple")); echo ""; var_dump(password_strength("Super Monkey Ball")); echo ""; var_dump(password_strength("Tr0ub4dor&3")); echo ""; var_dump(password_strength("abc123")); echo ""; var_dump(password_strength("sweet"));

6.检测浏览器语言，只提供可用的$availableLanguages作为数组(‘en’, ‘de’, ‘es’)

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

7.创建数据URL

function data_uri($file, $mime) {  $contents=file_get_contents($file);  $base64=base64_encode($contents);  echo "data:$mime;base64,$base64";}

8.创建更加友好的页面标题SEO URL

输入示例：$title = “This foo’s bar is rockin’ cool!”; echo makeseoname($title); //RETURNS: //this-foos-bar-is-rockin-cool

function make_seo_name($title) {      return preg_replace('/[^a-z0-9_-]/i', '', strtolower(str_replace(' ', '-', trim($title))));  }  

9.终极加密功能

// f(ucking) u(ncrackable) e(ncryption) function by BlackHatDBL (www.netforme.net)  function fue($hash,$times) {      // Execute the encryption(s) as many times as the user wants      for($i=$times;$i>0;$i--) {          // Encode with base64...          $hash=base64_encode($hash);          // and md5...          $hash=md5($hash);          // sha1...          $hash=sha1($hash);          // sha256... (one more)          $hash=hash("sha256", $hash);          // sha512          $hash=hash("sha512", $hash);        }      // Finaly, when done, return the value      return $hash;  }  

10a.Tweeter Feed Runner——使用任意twitter名，可在任意页面上加载用户资源。

pversion;       }       public function loadTimeline($user, $max = 20){           $this->twitURL .= 'statuses/user_timeline.xml?screen_name='.$user.'&count='.$max;           $ch        = curl_init();           curl_setopt($ch, CURLOPT_URL, $this->twitURL);           curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);           $this->xml = curl_exec($ch);           return $this;       }       public function getTweets(){           $this->twitterArr = $this->getTimelineArray();           $tweets = array();           foreach($this->twitterArr->status as $status){               $tweets[$status->created_at->__toString()] = $status->text->__toString();           }           return $tweets;       }       public function getTimelineArray(){           return simplexml_load_string($this->xml);       }       public function formatTweet($tweet){           $tweet = preg_replace("/(http(.+?))( |$)/","$1$3", $tweet);           $tweet = preg_replace("/#(.+?)(\h|\W|$)/", "#$1$2", $tweet);           $tweet = preg_replace("/@(.+?)(\h|\W|$)/", "@$1$2", $tweet);           return $tweet;       }   }  

10b. Tweeter Feed Runner——用于在主题中创建文件，比如：example.php

loadTimeline("phpsnips")->getTweets();   foreach($feed as $time => $message){       echo "<div class='tweet'>".$twitter->formatTweet($message)."<br />At: ".$time."</div>";   }  

11. 查看邮件是否已被阅读

当你在发送邮件时，你或许很想知道该邮件是否被对方已阅读。这里有段非常有趣的代码片段能够显示对方IP地址记录阅读的实际日期和时间。

<?error_reporting(0);Header("Content-Type: image/jpeg");//Get IPif (!empty($_SERVER['HTTP_CLIENT_IP'])){  $ip=$_SERVER['HTTP_CLIENT_IP'];}elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){  $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];}else{  $ip=$_SERVER['REMOTE_ADDR'];}//Time$actual_time = time();$actual_day = date('Y.m.d', $actual_time);$actual_day_chart = date('d/m/y', $actual_time);$actual_hour = date('H:i:s', $actual_time);//GET Browser$browser = $_SERVER['HTTP_USER_AGENT'];    //LOG$myFile = "log.txt";$fh = fopen($myFile, 'a+');$stringData = $actual_day . ' ' . $actual_hour . ' ' . $ip . ' ' . $browser . ' ' . "\r\n";fwrite($fh, $stringData);fclose($fh);//Generate Image (Es. dimesion is 1x1)$newimage = ImageCreate(1,1);$grigio = ImageColorAllocate($newimage,255,255,255);ImageJPEG($newimage);ImageDestroy($newimage);    ?>

12. 从网页中提取关键字

一段伟大的代码片段能够轻松的从网页中提取关键字。

$meta = get_meta_tags('http://www.emoticode.net/');$keywords = $meta['keywords'];// Split keywords$keywords = explode(',', $keywords );// Trim them$keywords = array_map( 'trim', $keywords );// Remove empty values$keywords = array_filter( $keywords );print_r( $keywords );

13. 查找页面上的所有链接

使用DOM，你可以轻松从任何页面上抓取链接，代码示例如下：

$html = file_get_contents('http://www.php100.com');$dom = new DOMDocument();@$dom->loadHTML($html);// grab all the on the page$xpath = new DOMXPath($dom);$hrefs = $xpath->evaluate("/html/body//a");for ($i = 0; $i < $hrefs->length; $i++) {       $href = $hrefs->item($i);       $url = $href->getAttribute('href');       echo $url.'<br />';}

14. 自动转换URL，跳转至超链接

在WordPress中，如果你想自动转换URL，跳转至超链接页面，你可以利用内置的函数make_clickable()执行此操作。如果你想基于WordPress之外操作该程序，那么你可以参考wp-includes/formatting.php源代码。

function _make_url_clickable_cb($matches) {    $ret = '';    $url = $matches[2];     if ( empty($url) )        return $matches[0];    // removed trailing [.,;:] from URL    if ( in_array(substr($url, -1), array('.', ',', ';', ':')) === true ) {        $ret = substr($url, -1);        $url = substr($url, 0, strlen($url)-1);    }    return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $ret;} function _make_web_ftp_clickable_cb($matches) {    $ret = '';    $dest = $matches[2];    $dest = 'http://' . $dest;     if ( empty($dest) )        return $matches[0];    // removed trailing [,;:] from URL    if ( in_array(substr($dest, -1), array('.', ',', ';', ':')) === true ) {        $ret = substr($dest, -1);        $dest = substr($dest, 0, strlen($dest)-1);    }    return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>" . $ret;} function _make_email_clickable_cb($matches) {    $email = $matches[2] . '@' . $matches[3];    return $matches[1] . "<a href=\"mailto:$email\">$email</a>";} function make_clickable($ret) {    $ret = ' ' . $ret;    // in testing, using arrays here was found to be faster    $ret = preg_replace_callback('#([\s>])([\w]+?://[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_make_url_clickable_cb', $ret);    $ret = preg_replace_callback('#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_make_web_ftp_clickable_cb', $ret);    $ret = preg_replace_callback('#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret);     // this one is not in an array because we need it to run last, for cleanup of accidental links within links    $ret = preg_replace("#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i", "$1$3</a>", $ret);    $ret = trim($ret);    return $ret;}

15. 创建数据URL

数据URL可以直接嵌入到HTML/CSS/JS中，以节省大量的 HTTP请求。 下面的这段代码可利用$file轻松创建数据URL。

function data_uri($file, $mime) {  $contents=file_get_contents($file);  $base64=base64_encode($contents);  echo "data:$mime;base64,$base64";}

16. 从服务器上下载&保存一个远程图片 

当你在搭建网站时，从远程服务器下载某张图片并且将其保存在自己的服务器上，这一操作会经常用到。代码如下：

$image = file_get_contents('http://www.php100.com/image.jpg');file_put_contents('/images/image.jpg', $image);//Where to save the image

17. 移除Remove Microsoft Word HTML Tag

当你使用Microsoft Word会创建许多Tag，比如font，span，style，class等。这些标签对于Word本身而言是非常有用的，但是当你从Word粘贴至网 页时，你会发现很多无用的Tag。因此，下面的这段代码可帮助你删除所有无用的Word HTML Tag。

function cleanHTML($html) {/// <summary>/// Removes all FONT and SPAN tags, and all Class and Style attributes./// Designed to get rid of non-standard Microsoft Word HTML tags./// </summary>// start by completely removing all unwanted tags$html = ereg_replace("<(/)?(font|span|del|ins)[^>]*>","",$html);// then run another pass over the html (twice), removing unwanted attributes$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<\1>",$html);$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<\1>",$html);return $html}

18. 检测浏览器语言

如果你的网站上有多种语言，那么可以使用这段代码作为默认的语言来检测浏览器语言。该段代码将返回浏览器客户端使用的初始语言。

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;}

19. 显示Facebook 粉丝数量

如果你的网站或者博客上有内链的Facebook页面，你或许想知道拥有多少粉丝。这段代码将帮助你查看Facebook粉丝数，记住，别忘了在你的页面ID第二行添加该段代码。

<?php    $page_id = "YOUR PAGE-ID";    $xml = @simplexml_load_file("http://api.facebook.com/restserver.php?method=facebook.fql.query&query=SELECT%20fan_count%20FROM%20page%20WHERE%20page_id=".$page_id."") or die ("a lot");    $fans = $xml->page->fan_count;    echo $fans;?>