生成随机数字和字母 [英] Generating a random numbers and letters

问题描述

我可以要求一个代码来生成一个单词中的随机字母和数字吗?我知道有一个PHP函数rand()，但我不知道它是否也适用于字母.还有一个名为mt_rand()的函数，但我不知道它是如何工作的.我正计划生成这样的单词:

Can I ask for a certain code on how to generate a random letters and numbers in one word. I know there's a PHP function rand(), but I don't know if it's also applicable with letters. There's also a function called mt_rand() but I don't know how it works. I'm planning on generating a word like this one:

$randomcode = re784dfg7ert7;

你们在这个代码上有任何简单的代码吗?预先感谢！

Do you guys have any simple code on this one? Thanks in advance!

推荐答案

这是一种更广泛的方法，我不断使用它来生成随机数，字母或混合数:

This is a more extensive method that I use constantly to generate random numbers, letters or mixed:

function assign_rand_value($num) {

    // accepts 1 - 36
    switch($num) {
        case "1"  : $rand_value = "a"; break;
        case "2"  : $rand_value = "b"; break;
        case "3"  : $rand_value = "c"; break;
        case "4"  : $rand_value = "d"; break;
        case "5"  : $rand_value = "e"; break;
        case "6"  : $rand_value = "f"; break;
        case "7"  : $rand_value = "g"; break;
        case "8"  : $rand_value = "h"; break;
        case "9"  : $rand_value = "i"; break;
        case "10" : $rand_value = "j"; break;
        case "11" : $rand_value = "k"; break;
        case "12" : $rand_value = "l"; break;
        case "13" : $rand_value = "m"; break;
        case "14" : $rand_value = "n"; break;
        case "15" : $rand_value = "o"; break;
        case "16" : $rand_value = "p"; break;
        case "17" : $rand_value = "q"; break;
        case "18" : $rand_value = "r"; break;
        case "19" : $rand_value = "s"; break;
        case "20" : $rand_value = "t"; break;
        case "21" : $rand_value = "u"; break;
        case "22" : $rand_value = "v"; break;
        case "23" : $rand_value = "w"; break;
        case "24" : $rand_value = "x"; break;
        case "25" : $rand_value = "y"; break;
        case "26" : $rand_value = "z"; break;
        case "27" : $rand_value = "0"; break;
        case "28" : $rand_value = "1"; break;
        case "29" : $rand_value = "2"; break;
        case "30" : $rand_value = "3"; break;
        case "31" : $rand_value = "4"; break;
        case "32" : $rand_value = "5"; break;
        case "33" : $rand_value = "6"; break;
        case "34" : $rand_value = "7"; break;
        case "35" : $rand_value = "8"; break;
        case "36" : $rand_value = "9"; break;
    }
    return $rand_value;
}

function get_rand_alphanumeric($length) {
    if ($length>0) {
        $rand_id="";
        for ($i=1; $i<=$length; $i++) {
            mt_srand((double)microtime() * 1000000);
            $num = mt_rand(1,36);
            $rand_id .= assign_rand_value($num);
        }
    }
    return $rand_id;
}

function get_rand_numbers($length) {
    if ($length>0) {
        $rand_id="";
        for($i=1; $i<=$length; $i++) {
            mt_srand((double)microtime() * 1000000);
            $num = mt_rand(27,36);
            $rand_id .= assign_rand_value($num);
        }
    }
    return $rand_id;
}

function get_rand_letters($length) {
    if ($length>0) {
        $rand_id="";
        for($i=1; $i<=$length; $i++) {
            mt_srand((double)microtime() * 1000000);
            $num = mt_rand(1,26);
            $rand_id .= assign_rand_value($num);
        }
    }
    return $rand_id;
}

---

用法:

基本上，我在数组中有一个主函数，然后我调用辅助函数以根据length参数构建我的字符串:

Basically I have a main function with the array, then I call secondary functions to build my string based on the length parameter:

字母:

Letters:

$str = get_rand_letters(8); // Only Letters

数字:

Numbers:

$str = get_rand_numbers(8); // Only Numbers

字母数字:

AlphaNumeric:

$str = get_rand_alphanumeric(8); // Numbers and Letters

Kerrek SB 回答了此问题，但这可能有助于某人搜索更广泛，更灵活的方法.

This Question is answered by Kerrek SB, but this may help someone searching for a more extensive and flexible way.

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