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超级有用的9个PHP代码片段

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Release: 2016-06-20 12:33:05
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超级有用的9个PHP代码片段

在开发网站、app或博客时,代码片段可以真正地为你节省时间。今天,我们就来分享一下我收集的一些超级有用的PHP代码片段。一起来看一看吧!

释怀 2016/03/30

在开发网站、app或博客时,代码片段可以真正地为你节省时间。今天,我们就来分享一下我收集的一些超级有用的PHP代码片段。一起来看一看吧!

1.创建数据URI

数据URI在嵌入图像到HTML / CSS / JS中以节省HTTP请求时非常有用,并且可以减少网站的加载时间。下面的函数可以创建基于$file的数据URI。

function data_uri($file, $mime) { $contents=file_get_contents($file); $base64=base64_encode($contents); echo "data:$mime;base64,$base64";}
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2.合并JavaScript和CSS文件

另一个可以尽量减少HTTP请求和节省页面加载时间的好建议是:合并你的CSS和JS文件。虽然我更建议大家使用专用插件(例如minify),但使用PHP来合并文件也非常容易。我们来看一下:

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 }}
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并且,用法是这样的:

$files = array( 'http://example/files/sample_js_file_1.js', 'http://example/files/sample_js_file_2.js', 'http://example/files/beautyquote_functions.js', 'http://example/files/crop.js', 'http://example/files/jquery.autosize.min.js', );echo combine_my_files($files, 'minified_files/', md5("my_mini_file").".js");
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3.查看你的电子邮件是否已读

当发送电子邮件时,你会希望知道你的邮件是否已读。这里有一个非常有趣的代码片段,它可以记录阅读你邮件的IP地址,以及实际的日期和时间。

<?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);?>
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4.从网页提取关键词

正如这小标题所说的那样:这个代码片段能让你轻易地从网页中提取元关键词。

$meta = get_meta_tags('http://www.emoticode.net/');$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 );
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5.查找页面上的所有链接

使用DOM,你可以轻松地抓取来网页上的所有链接。这里有一个工作示例:

$html = file_get_contents('http://www.example.com');$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 />';}
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6.自动转换URL为可点击的超链接

在WordPress中,如果你想在字符串中自动转换所有的URL成可点击的超链接,那么使用内置函数make_clickable()可以让你心想事成。如果你需要在WordPress之外这么做,那么你可以在wp-includes/formatting.php参考该函数的源代码:

function _make_url_clickable_cb($matches) {$ret = '';$url = $matches[2];if ( empty($url) )return $matches[0];// removed trailing [.,;:] from URLif ( in_array(substr($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 $matches[0];// removed trailing [,;:] from URLif ( in_array(substr($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;}
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7.在你的服务器上下载并保存远程图像

在远程服务器上下载一个图像,并将其保存在自己的服务器上,在建立网站时很有用,而且这也很容易做到。下面的这两行代码就能为你办到。

$image = file_get_contents('http://www.url.com/image.jpg');file_put_contents('/images/image.jpg', $image); //Where to save the image
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8.检测浏览器语言

如果你的网站使用多种语言,那么检测浏览器语言,并将这种语言作为默认语言会很有用。下面的代码将返回客户浏览器使用的语言。

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;}
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9.全文显示Facebook粉丝的数量

如果你的网站或博客有一个Facebook的页面,那么你可能想要显示你有多少个粉丝。这个代码片段可以帮助你获取Facebook粉丝的数量。不要忘记在第二行添加你的页面ID。页面ID可以在地址 http://faceb ook.com/your pagename/inf o 找到。

<?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;?>
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来自: http://www.codeceo.com/article/9-useful-php-code-snippets.html

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