随机生成自定义位数英文字符串
//生成随机英文字符串 function getEnglishStr($length) { $str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; $strLength = strlen($str)-1; $finalStr = ""; for($j=0;$j<$length;$j++) { $finalStr .= substr($str,rand(0,$strLength),1); } return $finalStr; }