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