## 方法一:shuffle函數（打亂數組）和mt_rand函數（生成隨機數，比rand速度快四倍） /** * 獲得隨機字符串 * @param $len 需要的長度 * @param $special 是否需要特殊符號 * @return string 返回隨機字符串 */ function getRandomStr($len, $special=true){ $chars = array( "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" ); if($special){ $chars = array_merge($chars, array( "!", "@", "#", "$", "?", "|", "{", "/", ":", ";", "%", "^", "&", "*", "(", ")", "-", "_", "[", "]", "}", "<", ">", "~", "+", "=", ",", "." )); } $charsLen = count($chars) - 1; shuffle($chars); //打亂數組順序 $str = ''; for($i=0; $i<$len; $i++){ $str .= $chars[mt_rand(0, $charsLen)]; //隨機取出一位 } return $str; } ## 方法二、str_shuffle函數（打亂字符串順序）和mt_rand函數 //取隨機10位字符串 $strs="QWERTYUIOPASDFGHJKLZXCVBNM1234567890qwertyuiopasdfghjklzxcvbnm"; $name=substr(str_shuffle($strs),mt_rand(0,strlen($strs)-11),10); echo $name; ## 方法三、md5(),uniqid(),microtime()生成唯一的32位字符串 $uniqid = md5(uniqid(microtime(true),true)); //microtime(true) 返回系統當前時間戳的毫秒數 ## 其他方法: /** * 方法一：獲取隨機字符串 * @param number $length 長度 * @param string $type 類型 * @param number $convert 轉換大小寫 * @return string 隨機字符串 */ function random($length = 6, $type = 'string', $convert = 0) { $config = array( 'number' => '1234567890', 'letter' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 'string' => 'abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789', 'all' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890' ); if (!isset($config[$type])) $type = 'string'; $string = $config[$type]; $code = ''; $strlen = strlen($string) - 1; for ($i = 0; $i < $length; $i++) { $code .= $string{mt_rand(0, $strlen)}; } if (!empty($convert)) { $code = ($convert > 0) ? strtoupper($code) : strtolower($code); } return $code; } /** * 方法二：獲取隨機字符串 * @param int $randLength 長度 * @param int $addtime 是否加入當前時間戳 * @param int $includenumber 是否包含數字 * @return string */ function rand_str($randLength = 6, $addtime = 1, $includenumber = 0) { if ($includenumber) { $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNPQEST123456789'; } else { $chars = 'abcdefghijklmnopqrstuvwxyz'; } $len = strlen($chars); $randStr = ''; for ($i = 0; $i < $randLength; $i++) { $randStr .= $chars[mt_rand(0, $len - 1)]; } $tokenvalue = $randStr; if ($addtime) { $tokenvalue = $randStr . time(); } return $tokenvalue; }