一．查看邮件是否已被阅读 当你发送邮件时，你肯定很想知道你的邮件是否已被对方查看。下面的代码就能实现记录阅读你邮件的IP地址，还有实际的阅读日期和时间。复制代码 代码如下: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 . " " . $browser . " " . "";fwrite($fh, $stringData);fclose($fh);//Generate Image (Es. dimesion is 1x1)$newimage = ImageCreate(1,1);$grigio = ImageColorAllocate($newimage,255,255,255);ImageJPEG($newimage);ImageDestroy($newimage);?>源代码：http://www.emoticode.net/php/code-to-find-out-if-your-email-has-been-read.html 二．从网页中提取关键词
这段优秀的代码可以简单地实现从网页中提取关键词的功能。复制代码 代码如下:$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( $keywords );源代码：http://www.emoticode.net/php/extract-keywords-from-any-webpage.html 三．查找页面上的所有链接
使用DOM，你可以在任意页面上抓取链接，示例如下。复制代码 代码如下:$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 $url."";}源代码：http://snipplr.com/view/70489/find-all-links-on-a-page/ 四．自动转换URL为可点击超链接 在Wordpress中，如果你想自动转换所有的URLs为可点击超链接，你就可以使用内置函数make_clickable()实现。当你在WordPress外操作时，你可以参考wp-includes/formatting.php中的源代码。 复制代码 代码如下: function _make_url_clickable_cb($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 $matches[1] . "$url" . $ret;} function _make_web_ftp_clickable_cb($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 $matches[1] . "$dest" . $ret;} function _make_email_clickable_cb($matches) { $email = $matches[2] . "@" . $matches[3]; return $matches[1] . "$email";} 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("#(]+?>|>))]+?>([^>]+?)#i", "$1$3", $ret); $ret = trim($ret); return $ret;}源代码：http://zenverse.net/php-function-to-auto-convert-url-into-hyperlink/ 五．创建数据URI
数据URI可以帮助将图像嵌入到HTML/CSS/JS中，从而节省HTTP请求。下面的函数可以利用$file创建数据URI。复制代码 代码如下:function data_uri($file, $mime) { $contents=file_get_contents($file); $base64=base64_encode($contents); echo "data:$mime;base64,$base64";}源代码：http://css-tricks.com/snippets/php/create-data-uris/ 六．下载和保存远程图片到你的服务器 当你在搭建网站时，很可能会从远程服务器上下载图片保存到你自己的服务器上，下面的代码就可以帮助你实现这个功能。复制代码 代码如下:$image = file_get_contents("http://www.php100.com/image.jpg");file_put_contents("/images/image.jpg", $image); //Where to save the image源代码：http://www.catswhocode.com/blog/snippets/download-save-a-remote-image-on-your-server-using-php 七．移除Microsoft Word HTML标签 当你使用Microsoft Word时，会创建很多标签tag，比如font、span、style、class等，这些标签在Word中十分有用，但当你从Word中把文本粘贴到网页上，就会出现很多没用的标签。下面实用的函数可以帮助你清除所有的Word HTML标签。复制代码 代码如下:function cleanHTML($html) {/// /// Removes all FONT and SPAN tags, and all Class and Style attributes./// Designed to get rid of non-standard Microsoft Word HTML tags./// // 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 $html}源代码：http://tim.mackey.ie/CommentView,guid,2ece42de-a334-4fd0-8f94-53c6602d5718.aspx 八．检测浏览器语言
如果你的网站是多种语言的，下面的代码可以帮助你检测浏览器语言，它会返回客户端浏览器的默认语言。复制代码 代码如下:function get_client_language($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;}源代码：http://snipplr.com/view/12631/detect-browser-language/ 九．显示Facebook上的粉丝数量 如果在你的网站或博客中，链有Facebook页面，你可能希望显示Facebook上的粉丝数量，下面的代码就可以帮助你获取粉丝数量，另外不要忘记在代码第二行添加你的页面ID。复制代码 代码如下: $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;?> 源代码：http://www.wprecipes.com/display-number-of-facebook-fans-in-full-text-on-your-wordpress-blog
