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：
复制代码 代码如下:PHP 就是： Quick and DirtyJava 就是： Beauty and SlowlyRuby 就是： Quick and Beautypython 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、黑名单过滤复制代码 代码如下: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:3dog:3cat:2monkey:2二、随机颜色生成器复制代码 代码如下: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、从网络下载文件复制代码 代码如下: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 $rank[2]; else return FALSE; break; default: return FALSE; break; } } // Alexa Page Rank: echo "Alexa Rank: ".page_rank("techug.com"); echo ""; // Google Page Rank echo "Google Rank: ".page_rank("techug.com", "google");
五、强制下载文件复制代码 代码如下:$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头像复制代码 代码如下: $gravatar_link = "http://www.gravatar.com/avatar/" . md5($comment_author_email) . "?s=32"; echo "<img src="" . $gravatar_link . "" />";七、通过cURL获取RSS订阅数复制代码 代码如下:$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、时间差异计算函数复制代码 代码如下: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、裁剪图片复制代码 代码如下:$filename= "test.jpg";list($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($dst_im);十、检查网站是否宕机复制代码 代码如下:function Visit($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";
