方法一:shuffle函数（打乱数组）和mt_rand函数（生成随机数，比rand速度快四倍）

 /**
 * 获得随机字符串
 * @param $len           需要的长度
 * @param $special    是否需要特殊符号
 * @return string        返回随机字符串
 */
 function getRandomStr($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);                            //打乱数组顺序
     $str = '';
     for($i=0; $i<$len; $i++){
         $str .= $chars[mt_rand(0, $charsLen)];    //随机取出一位
     }
     return $str;
 }

方法二、str_shuffle函数（打乱字符串顺序）和mt_rand函数

//取随机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)  返回系统当前时间戳的毫秒数

其他方法:

/**
     * 方法一：获取随机字符串
     * @param number $length 长度
     * @param string $type 类型
     * @param number $convert 转换大小写
     * @return string 随机字符串
*/
    function random($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：获取随机字符串
 * @param int $randLength 长度
 * @param int $addtime 是否加入当前时间戳
 * @param int $includenumber 是否包含数字
 * @return string
 */
function rand_str($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;
}

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http://www.virplus.com/thread-129.htm
转载请注明:2019-2-24 于 VirPlus 发表