本文我們就來分享一下我收集的一些超級有用的PHP代碼片段。一起來看一看吧!
1.創(chuàng)建數(shù)據(jù)URI
數(shù)據(jù)URI在嵌入圖像到HTML / CSS / JS中以節(jié)省HTTP請求時非常有用,并且可以減少網(wǎng)站的加載時間。下面的函數(shù)可以創(chuàng)建基于$file的數(shù)據(jù)URI。
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function data_uri( $file , $mime ) { $contents = file_get_contents ( $file ); $base64 = base64_encode ( $contents ); echo "data:$mime;base64,$base64" ; } |
2.合并JavaScript和CSS文件
另一個可以盡量減少HTTP請求和節(jié)省頁面加載時間的好建議是:合并你的CSS和JS文件。雖然我更建議大家使用專用插件(例如minify),但使用PHP來合并文件也非常容易。我們來看一下:
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function combine_my_files( $array_files , $destination_dir , $dest_file_name ){ if (! is_file ( $destination_dir . $dest_file_name )){ //continue only if file doesn't exist $content = "" ; foreach ( $array_files as $file ){ //loop through array list $content .= file_get_contents ( $file ); //read each file } //You can use some sort of minifier here //minify_my_js($content); $new_file = fopen ( $destination_dir . $dest_file_name , "w" ); //open file for writing fwrite( $new_file , $content ); //write to destination fclose( $new_file ); return '<script src="' . $destination_dir . $dest_file_name . '"></script>' ; //output combined file } else { //use stored file return '<script src="' . $destination_dir . $dest_file_name . '"></script>' ; //output combine file } } |
并且,用法是這樣的:
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$files = array ( 'http://example/files/sample_js_file_1.js' , 'http://example/files/sample_js_file_2.js' , 'http://example/files/beautyquote_functions.js' , 'http://example/files/crop.js' , 'http://example/files/jquery.autosize.min.js' , ); echo combine_my_files( $files , 'minified_files/' , md5( "my_mini_file" ). ".js" ); |
3.查看你的電子郵件是否已讀
當(dāng)發(fā)送電子郵件時,你會希望知道你的郵件是否已讀。這里有一個非常有趣的代碼片段,它可以記錄閱讀你郵件的IP地址,以及實際的日期和時間。
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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( $newimage ); ?> |
4.從網(wǎng)頁提取關(guān)鍵詞
正如這小標(biāo)題所說的那樣:這個代碼片段能讓你輕易地從網(wǎng)頁中提取元關(guān)鍵詞。
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$meta = get_meta_tags( 'http://www.juzhan.com.cn/' ); $keywords = $meta [ 'keywords' ]; // Split keywords $keywords = explode ( ',' , $keywords ); // Trim them $keywords = array_map ( 'trim' , $keywords ); // Remove empty values $keywords = array_filter ( $keywords ); print_r( $keywords ); |
5.查找頁面上的所有鏈接
使用DOM,你可以輕松地抓取來網(wǎng)頁上的所有鏈接。這里有一個工作示例:
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$html = file_get_contents ( 'http://www.example.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 />' ; } |
6.自動轉(zhuǎn)換URL為可點擊的超鏈接
在WordPress中,如果你想在字符串中自動轉(zhuǎn)換所有的URL成可點擊的超鏈接,那么使用內(nèi)置函數(shù)make_clickable()可以讓你心想事成。如果你需要在WordPress之外這么做,那么你可以在wp-includes/formatting.php參考該函數(shù)的源代碼:
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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]; $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 $ret ; } |
7.在你的服務(wù)器上下載并保存遠(yuǎn)程圖像
在遠(yuǎn)程服務(wù)器上下載一個圖像,并將其保存在自己的服務(wù)器上,在建立網(wǎng)站時很有用,而且這也很容易做到。下面的這兩行代碼就能為你辦到。
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$image = file_get_contents ( 'http://www.url.com/image.jpg' ); file_put_contents ( '/images/image.jpg' , $image ); //Where to save the image |
8.檢測瀏覽器語言
如果你的網(wǎng)站使用多種語言,那么檢測瀏覽器語言,并將這種語言作為默認(rèn)語言會很有用。下面的代碼將返回客戶瀏覽器使用的語言。
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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 ; } |
9.全文顯示Facebook粉絲的數(shù)量
如果你的網(wǎng)站或博客有一個Facebook的頁面,那么你可能想要顯示你有多少個粉絲。這個代碼片段可以幫助你獲取Facebook粉絲的數(shù)量。不要忘記在第二行添加你的頁面ID。頁面ID可以在地址http://facebook.com/yourpagename/info找到。
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<?php $page_id = "302807633129400" ; $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 ; ?> |
以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助。