PHP中常用的一些功能总结（归纳）

1.获取网站是http还是https ?

$http_type = ((isset($_SERVER[ HTTPS ]) $_SERVER[ HTTPS ] ==  on ) || (isset($_SERVER[ HTTP_X_FORWARDED_PROTO ]) $_SERVER[ HTTP_X_FORWARDED_PROTO ] == https )) ? http:// :  http:// 

2.删除数组中的空数据

function where_data($data) foreach ($data as $k = $v) { if (empty($v) $v != 0 ) { unset($data[$k]); return $data; }

3.截取富文本中的其中一部分

/** * 将富文本中文字截取其中的一部分 * @param $content * @return stringfunction html_substr_content($content,$length=100) $content = htmlspecialchars_decode($content); //把一些预定义的 HTML 实体转换为字符 $content = str_replace( , , $content); //将空格替换成空 $content = strip_tags($content); //函数剥去字符串中的 HTML、XML 以及 PHP 的标签,获取纯文本内容 $con = mb_substr($content, 0, $length, utf-8 //返回字符串中的前100字符串长度的字符 return $con;}

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 $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、从网上下载文件

set_time_limit(0); // Supports all file types // URL Here: $url = http://VeVb.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、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;}

五、截取图片

$filename= test.jpg list($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);

六、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 echo Website DOWN 

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