分享自定义的几个PHP功能函数

最近不是在折腾论坛嘛,各种类各种函数,原创一些,从别人那儿qiang过来一些,在此分享出来,希望有朋友能用的到~

注意:部分函数可能不够完善,由此造成的漏洞风险自担~

提交过滤

  function filter($text)  {   //完全过滤注释   $text = preg_replace('/<!--?.*-->/', '', $text);   //完全过滤js   $text = preg_replace('/<script?.*/script>/', '', $text);   //过滤危险的属性,如:过滤on事件lang js   while (preg_match('/(<[^><]+)( lang|action|background|codebase|dynsrc|lowsrc)[^><]+/i', $text, $mat)) {   $text = str_replace($mat[0], $mat[1], $text);   }   while (preg_match('/(<[^><]+)(window.|javascript:|js:|about:|file:|document.|vbs:|cookie)([^><]*)/i', $text, $mat)) {   $text = str_replace($mat[0], $mat[1] . $mat[3], $text);   }   //过滤多余html   $text = preg_replace('/</?(html|head|meta|link|base|basefont|body|bgsound|script|form|iframe|frame|frameset|applet|id|ilayer|layer|name|script|xml)[^><]*>/i', '', $text);   //反转换   $text = str_replace('[', '<', $text);   $text = str_replace(']', '>', $text);   $text = str_replace('|', '"', $text);   return $text;  }  

提交过滤2

  function stripslashes_array(&$array)  {   while (list($key, $var) = each($array)) {   if ($key != 'argc' && $key != 'argv' && (strtoupper($key) != $key || '' . intval($key) == "$key")) {   if (is_string($var)) {   $array[$key] = stripslashes($var);   }   if (is_array($var)) {   $array[$key] = stripslashes_array($var);   }   }   }   return $array;  }  

字符串截取(这个是emlog里提出来的,其实也就是substr的增强版)

  function subString($strings, $start, $length)  {   if (function_exists('mb_substr') && function_exists('mb_strlen')) {   $sub_str = mb_substr($strings, $start, $length, 'utf8');   return mb_strlen($sub_str, 'utf8') < mb_strlen($strings, 'utf8') ? $sub_str . '...' : $sub_str;   }   $str = substr($strings, $start, $length);   $char = 0;   for ($i = 0; $i < strlen($str); $i++) {   if (ord($str[$i]) >= 128)   $char++;   }   $str2 = substr($strings, $start, $length + 1);   $str3 = substr($strings, $start, $length + 2);   if ($char % 3 == 1) {   if ($length <= strlen($strings)) {   $str3 = $str3 .= '...';   }   return $str3;   }   if ($char % 3 == 2) {   if ($length <= strlen($strings)) {   $str2 = $str2 .= '...';   }   return $str2;   }   if ($char % 3 == 0) {   if ($length <= strlen($strings)) {   $str = $str .= '...';   }   return $str;   }  }  

IP地址匿名化(最后一位替换为星号)

  function AnonymousIP()   {   $ip = GetIP();   if ($ip == "Unknown") {   $removed_ip = "未知用户";   }   if (strpos($ip, ":")) {   $removed_ip = "IPv6用户";   } else {   $reg1 = '/((?:d+.){3})d+/';   $reg2 = '~(d+).(d+).(d+).(d+)~';   $removed_ip = preg_replace($reg1, "\1*", $ip);   }   return $removed_ip;  }  

获取客户端IP地址

  function GetIP()  {   if (@$_SERVER["HTTP_X_FORWARDED_FOR"])   $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];   else if (@$_SERVER["HTTP_CLIENT_IP"])   $ip = $_SERVER["HTTP_CLIENT_IP"];   else if (@$_SERVER["REMOTE_ADDR"])   $ip = $_SERVER["REMOTE_ADDR"];   else if (@getenv("HTTP_X_FORWARDED_FOR"))   $ip = getenv("HTTP_X_FORWARDED_FOR");   else if (@getenv("HTTP_CLIENT_IP"))   $ip = getenv("HTTP_CLIENT_IP");   else if (@getenv("REMOTE_ADDR"))   $ip = getenv("REMOTE_ADDR");   else   $ip = "Unknown";   return $ip;  }  

字符串加密(支持中文)

  function dencrypt($string, $isEncrypt = true, $key = "youdian")  {   if (!isset($string{0}) || !isset($key{0})) {   return false;   }      $dynKey = $isEncrypt ? hash('sha1', microtime(true)) : substr($string, 0, 40);   $fixedKey = hash('sha1', $key);      $dynKeyPart1 = substr($dynKey, 0, 20);   $dynKeyPart2 = substr($dynKey, 20);   $fixedKeyPart1 = substr($fixedKey, 0, 20);   $fixedKeyPart2 = substr($fixedKey, 20);   $key = hash('sha1', $dynKeyPart1 . $fixedKeyPart1 . $dynKeyPart2 . $fixedKeyPart2);      $string = $isEncrypt ? $fixedKeyPart1 . $string . $dynKeyPart2 : (isset($string{339}) ? gzuncompress(base64_decode(substr($string, 40))) : base64_decode(substr($string, 40)));      $n = 0;   $result = '';   $len = strlen($string);      for ($n = 0; $n < $len; $n++) {   $result .= chr(ord($string{$n}) ^ ord($key{$n % 40}));   }   return $isEncrypt ? $dynKey . str_replace('=', '', base64_encode($n > 299 ? gzcompress($result) : $result)) : substr($result, 20, -20);  }  

检查字符串是否包含中文

  function CheckChinese($string)  {   if (preg_match("/[x7f-xff]/", $string)) {   return true;   } else {   return false;   }  }  

隐藏文件真实路径

  function FileHeaderJump($file)  {   header('Content-Description: File Transfer');   header('Content-Type: application/octet-stream');   header('Content-Disposition: attachment; filename=' . basename($file));   header('Content-Transfer-Encoding: binary');   header('Expires: 0');   header('Cache-Control: must-revalidate, post-check=0, pre-check=0');   header('Pragma: public');   header('Content-Length: ' . filesize($file));   ob_clean();   flush();   readfile($file);   exit;  }  

生成随机字符串,自定义长度

  function CreateRandomString($length)  {   $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';   $password = "";   for ($i = 0; $i < $length; $i++) {   $password .= $chars[mt_rand(0, strlen($chars) - 1)];   }   return $password;  }  

分享自定义的几个PHP功能函数

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