超实用的PHP代码片段
一、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。
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<? error_reporting (0); Header( "Content-Type: image/jpeg" ); //Get IP if (! 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( $newimage ); ?> |
二、从网友中提取关键字
一段伟大的代码片段能够轻松的从网页中提取关键字。
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$keywords = $meta [ 'keywords' ]; // Split keywords $keywords = explode ( ',' , $keywords ); // Trim them $keywords = array_map ( 'trim' , $keywords ); // Remove empty values $keywords = array_filter ( $keywords ); print_r( $keywords ); |
三、查找页面上的所有链接
使用DOM,你可以轻松从任何页面上抓取链接,代码示例如下:
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$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 />' ; } |
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]; // 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]; 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 $ret ; } |
五、创建数据URL
数据URL可以直接嵌入到HTML/CSS/JS中,以节省大量的 HTTP请求。 下面的这段代码可利用$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" ; } |
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:
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file_put_contents ( '/images/image.jpg' , $image ); //Where to save the image |
七、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。
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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 } |
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 ; } |
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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<?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 ; ?> |
英文出自: Catswhocode