实用的PHP代码片段

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。 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 4

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。 

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

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二、从网友中提取关键字

一段伟大的代码片段能够轻松的从网页中提取关键字。

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

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三、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： 

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

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四、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。 

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function _make_url_clickable_cb($matches) {     $ret = '';     $url = $matches[2];        if ( empty($url) )         return $matches[0]; <span>    </span><span>// removed trailing [.,;:] from URL</span>     if ( in_array(substr($url, -1), array('.', ',', ';', ':')) === true ) {         $ret = substr($url, -1);         $url = substr($url, 0, strlen($url)-1);     }     return $matches[1] . "<a href="%5C%22%24url%5C%22" rel='\"nofollow\"'>$url</a>" . $ret; <span>}</span>    function _make_web_ftp_clickable_cb($matches) {     $ret = '';     $dest = $matches[2];     $dest = 'http://' . $dest;        if ( empty($dest) )         return $matches[0]; <span>    </span><span>// removed trailing [,;:] from URL</span>     if ( in_array(substr($dest, -1), array('.', ',', ';', ':')) === true ) {         $ret = substr($dest, -1);         $dest = substr($dest, 0, strlen($dest)-1);     }     return $matches[1] . "<a href="%5C%22%24dest%5C%22" rel='\"nofollow\"'>$dest</a>" . $ret; <span>}</span>    function _make_email_clickable_cb($matches) {     $email = $matches[2] . '@' . $matches[3];     return $matches[1] . "<a href="%5C%22mailto:%24email%5C%22">$email</a>"; <span>}</span>    function make_clickable($ret) {     $ret = ' ' . $ret; <span>    </span><span>// in testing, using arrays here was found to be faster</span>     $ret = preg_replace_callback('#([\s>])([\w]+?://[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#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);    <span>    </span><span>// this one is not in an array because we need it to run last, for cleanup of accidental links within links</span>     $ret = preg_replace("#(<a>]+?>|>))</a><a>]+?>([^>]+?)</a>#i", "$1$3", $ret);     $ret = trim($ret);     return $ret; <span>}</span>

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五、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。 

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

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六、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：

1 2	$image = file_get_contents('http://www.url.com/image.jpg'); file_put_contents('/images/image.jpg', $image);<span>//Where to save the image</span>

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七、移除Remove Microsoft Word HTML Tag

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

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八、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。 

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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; <span>}</span>

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九、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。 

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<span><?php </span></span>     $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; <span>?></span>