Use PHP to randomly generate a string with a specified number of digits

The main content of this article is to use PHP language to randomly generate the required number of strings, including uppercase and lowercase letters and numbers. It has certain reference value. Interested friends can learn about it.

php randomly generates the required number of characters

/**
 * 随机生成要求位数个字符串
 * @param length 规定几位字符
 */
function getRandChar($length){
    $str = null;
    $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";//大小写字母以及数字
    $max = strlen($strPol)-1;

    for($i=0;$i<$length;$i++){
        $str.=$strPol[rand(0,$max)];
    }
    return $str;
}

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