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 and Beauty
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
function is_spam($text, $file, $split = \':\', $regex = false){ $handle = fopen($file, \'rb\'); $contents = fread($handle, filesize($file)); fclose($handle); $lines = explode(\"n\", $contents); $arr = array(); foreach($lines as $line){ list($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]) return true; } } return false; } $file = \'spam.txt\'; $str = \'This string has cat, dog word\'; if(is_spam($str, $file)) echo \'this is spam\'; else echo \'this is not spam\';
ab:3 dog:3 cat:2 monkey:2
二、随机颜色生成器
function randomColor() { $str = \'#\'; for($i = 0 ; $i < 6 ; $i++) { $randNum = rand(0 , 15); switch ($randNum) { case 10: $randNum = \'A\'; break; case 11: $randNum = \'B\'; break; case 12: $randNum = \'C\'; break; case 13: $randNum = \'D\'; break; case 14: $randNum = \'E\'; break; case 15: $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 $ch = curl_init(); // set URL and other appropriate options curl_setopt($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 resources curl_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
function page_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(\'~<div class=\"data (down|up)\"><img.+?>(.+?) </div>~im\',$content,$matches)){ return $matches[2]; }else{ return FALSE; } break; case \'google\': $rank = explode(\':\',$content); if($rank[2] != \'\') return $rank[2]; else return FALSE; break; default: return FALSE; break; } } // Alexa Page Rank: echo \'Alexa Rank: \'.page_rank(\'techug.com\'); echo \' \'; // Google Page Rank echo \'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 headers header(\"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 \'<img src=\"\' . $gravatar_link . \'\" />\';
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($ch);
八、时间差异计算函数
function ago($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] && $j < count($lengths)-1; $j++) { $difference /= $lengths[$j]; } $difference = round($difference); if($difference != 1) { $periods[$j].= \"s\"; } return \"$difference $periods[$j] \'ago\' \"; }
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($dst_im);
十、检查网站是否宕机
function Visit($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) return true; else return false; } if (Visit(\"http://www.google.com\")) echo \"Website OK\".\"n\"; else echo \"Website DOWN\";