php生成随机字符串

<?phpfunction getrandom (){ $mode = mt_rand(1,6);$length = mt_rand(1,6);//设置生成字符串长度switch ($mode){ case '1': $str = '1234567890'; break; case '2': $str = 'abcdefghijklmnopqrstuvwxyz';break;case '3': $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';break;case '4': $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';break;case '5': $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';break;case '6': $str = 'abcdefghijklmnopqrstuvwxyz1234567890';break;default: $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890'; break; } $result = ''; $l = strlen($str);for($i = 0;$i < $length;$i++){$num = rand(0, $l-1); $result .= $str[$num]; } return $result;}?>

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