[IT干货]10个必须收藏的PHP代码样例

作为一个正常的程序员，会好几种语言是十分正常的，相信大部分程序员也都会编写几句PHP程序，如果是WEB程序员，PHP一定是必备的，即使你没用它开发过大型软件项目，也一定多少了解它的语法。

尽管PHP经常被人诟病，被人贬低，被人当玩笑开，事实证明，PHP是全世界网站开发中使用率最高的编程语言。PHP最大的缺点是太简单，语法不严谨，框架体系很弱，但这也是它最大的优点，一个有点编程背景的普通人，只需要学习PHP半天时间，就可以上手开始开发web应用了。

网上有人总结几种编程语言的特点，我觉得也挺有道理的：

PHP 就是： Quick and Dirty

Java 就是： Beauty and Slowly

Ruby 就是： Quick andBeauty

Python 就是：Quick and Simple

在PHP的流行普及中，网上总结出了很多实用的PHP代码片段，这些代码片段在当你遇到类似的问题时，粘贴过去就可以使用，非常的高效，非常的省时省力。将这些程序员前辈总结出的优秀代码放到自己的知识库中，是一个善于学习的程序员的好习惯。

一、黑名单过滤

functionis_spam($text,$file,$split=':',$regex=false){$handle=fopen($file,'rb');$contents=fread($handle,filesize($file));fclose($handle);$lines=explode("n",$contents);$arr=array();foreach($linesas$line){list($word,$count)=explode($split,$line);if($regex)$arr[$word]=$count;else$arr[preg_quote($word)]=$count;}preg_match_all("~".implode('|',array_keys($arr))."~",$text,$matches);$temp=array();foreach($matches[0]as$match){if(!in_array($match,$temp)){$temp[$match]=$temp[$match]+1;if($temp[$match]>=$arr[$word])returntrue;}}returnfalse;}$file='spam.txt';$str='This string has cat, dog word';if(is_spam($str,$file))echo'this is spam';elseecho'this is not spam';

ab:3dog:3cat:2monkey:2

二、随机颜色生成器

functionrandomColor(){$str='#';for($i=0;$i<6;$i++){$randNum=rand(0,15);switch($randNum){case10:$randNum='A';break;case11:$randNum='B';break;case12:$randNum='C';break;case13:$randNum='D';break;case14:$randNum='E';break;case15:$randNum='F';break;}$str.=$randNum;}return$str;}$color=randomColor();

三、从网络下载文件

set_time_limit(0);// Supports all file types// URL Here:$url='http://somsite.com/some_video.flv';$pi=pathinfo($url);$ext=$pi['extension'];$name=$pi['filename'];// create a new cURL resource$ch=curl_init();// set URL and other appropriate optionscurl_setopt($ch,CURLOPT_URL,$url);curl_setopt($ch,CURLOPT_HEADER,false);curl_setopt($ch,CURLOPT_BINARYTRANSFER,true);curl_setopt($ch,CURLOPT_AUTOREFERER,true);curl_setopt($ch,CURLOPT_FOLLOWLOCATION,true);curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);// grab URL and pass it to the browser$opt=curl_exec($ch);// close cURL resource, and free up system resourcescurl_close($ch);$saveFile=$name.'.'.$ext;if(preg_match("/[^0-9a-z._-]/i",$saveFile))$saveFile=md5(microtime(true)).'.'.$ext;$handle=fopen($saveFile,'wb');fwrite($handle,$opt);fclose($handle);

四、Alexa/Google Page Rank

functionpage_rank($page,$type='alexa'){switch($type){case'alexa':$url='http://alexa.com/siteinfo/';$handle=fopen($url.$page,'r');break;case'google':$url='http://google.com/search?client=navclient-auto&ch=6-1484155081&features=Rank&q=info:';$handle=fopen($url.'http://'.$page,'r');break;}$content=stream_get_contents($handle);fclose($handle);$content=preg_replace("~(n|t|ss+)~",'',$content);switch($type){case'alexa':if(preg_match('~

(.+?)

~im',$content,$matches)){return$matches[2];}else{returnFALSE;}break;case'google':$rank=explode(':',$content);if($rank[2]!='')return$rank[2];elsereturnFALSE;break;default:returnFALSE;break;}}// Alexa Page Rank:echo'Alexa Rank: '.page_rank('techug.com');echo'

';// Google Page Rankecho'Google Rank: '.page_rank('techug.com','google');

五、强制下载文件

$filename=$_GET['file'];//Get the fileid from the URL// Query the file ID$query=sprintf("SELECT * FROM tableName WHERE id = '%s'",mysql_real_escape_string($filename));$sql=mysql_query($query);if(mysql_num_rows($sql)>0){$row=mysql_fetch_array($sql);// Set some headersheader("Pragma: public");header("Expires: 0");header("Cache-Control: must-revalidate, post-check=0, pre-check=0");header("Content-Type: application/force-download");header("Content-Type: application/octet-stream");header("Content-Type: application/download");header("Content-Disposition: attachment; filename=".basename($row['FileName']).";");header("Content-Transfer-Encoding: binary");header("Content-Length: ".filesize($row['FileName']));@readfile($row['FileName']);exit(0);}else{header("Location: /");exit;}

六、通过Email显示用户的Gravatar头像

$gravatar_link='http://www.gravatar.com/avatar/'.md5($comment_author_email).'?s=32';echo'';

七、通过cURL获取RSS订阅数

$ch=curl_init();curl_setopt($ch,CURLOPT_URL,'https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4');curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,2);$content=curl_exec($ch);$subscribers=get_match('/circulation="(.*)"/isU',$content);curl_close($ch);

八、时间差异计算函数

functionago($time){$periods=array("second","minute","hour","day","week","month","year","decade");$lengths=array("60","60","24","7","4.35","12","10");$now=time();$difference=$now-$time;$tense="ago";for($j=0;$difference>=$lengths[$j]&&$j

九、裁剪图片

$filename="test.jpg";list($w,$h,$type,$attr)=getimagesize($filename);$src_im=imagecreatefromjpeg($filename);$src_x='0';// begin x$src_y='0';// begin y$src_w='100';// width$src_h='100';// height$dst_x='0';// destination x$dst_y='0';// destination y$dst_im=imagecreatetruecolor($src_w,$src_h);$white=imagecolorallocate($dst_im,255,255,255);imagefill($dst_im,0,0,$white);imagecopy($dst_im,$src_im,$dst_x,$dst_y,$src_x,$src_y,$src_w,$src_h);header("Content-type: image/png");imagepng($dst_im);imagedestroy($dst_im);

十、检查网站是否宕机

functionVisit($url){$agent="Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)";$ch=curl_init();curl_setopt($ch,CURLOPT_URL,$url);curl_setopt($ch,CURLOPT_USERAGENT,$agent);curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);curl_setopt($ch,CURLOPT_VERBOSE,false);curl_setopt($ch,CURLOPT_TIMEOUT,5);curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);curl_setopt($ch,CURLOPT_SSLVERSION,3);curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);$page=curl_exec($ch);//echo curl_error($ch);$httpcode=curl_getinfo($ch,CURLINFO_HTTP_CODE);curl_close($ch);if($httpcode>=200&&$httpcode<300)returntrue;elsereturnfalse;}if(Visit("http://www.google.com"))echo"Website OK"."n";elseecho"Website DOWN";