在 Laravel 中生成随机数

Question

Please am working on a Project on Laravel and I wanted to Generate a Random Number in this format: one character in any position order and the rest integers. Example: C87465398745635, 87474M745436475, 98487464655378J8 etc. and this is my Controller:

    function generatePin( $number ) {
    $pins = array();
    for ($j=0; $j < $number; $j++) { 
        $string = str_random(15);
        $pin = Pin::where('pin', '=', $string)->first();
        if($pin){
            $j--;
        }else{
            $pins[$j] = $string;
        }
    }



    return $pins;
}

But it seems to be Generating something else like this: ZsbpEKw9lRHqGbv, i7LjvSiHgeGrNN8, pyJEcjhjd3zu9Su I have tried all I could but no success, Please any helping solution will be appreciated, Thanks

Answer 1

If you want to generate the random string like you said, replace:

$string = str_random(15);

with

// Available alpha caracters
$characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

// generate a pin based on 2 * 7 digits + a random character
$pin = mt_rand(1000000, 9999999)
    . mt_rand(1000000, 9999999)
    . $characters[rand(0, strlen($characters) - 1)];

// shuffle the result
$string = str_shuffle($pin);

Edit:

Before, the code wasn't generating a random alpha character all the time. Thats because Laravel's str_random generates a random alpha-numeric string, and sometimes that function returned a numeric value ( see docs ).

Answer 2

这应该给你 2 到 50 之间的随机数。

$randomId       =   rand(2,50);

Answer 3

use the function rand.

Example:

 echo rand(0, 99999);

Answer 4

Assuming that the $number you pass on generatePin is the length of pin:

function generatePin( $number ) {
    // Generate set of alpha characters
    $alpha = array();
    for ($u = 65; $u <= 90; $u++) {
        // Uppercase Char
        array_push($alpha, chr($u));
    }

    // Just in case you need lower case
    // for ($l = 97; $l <= 122; $l++) {
    //    // Lowercase Char
    //    array_push($alpha, chr($l));
    // }

    // Get random alpha character
    $rand_alpha_key = array_rand($alpha);
    $rand_alpha = $alpha[$rand_alpha_key];

    // Add the other missing integers
    $rand = array($rand_alpha);
    for ($c = 0; $c < $number - 1; $c++) {
        array_push($rand, mt_rand(0, 9));
        shuffle($rand);
    }

    return implode('', $rand);
}

Answer 5

You can use the rand() function to generate a random number. You can also create some characters and prefix the rand() with it.

Answer 6

Generate random number

echo generateRandomString(6) // Ex j4nDqQRiYafD

Implementation

function generateRandomString(int $n=0)
{
  $al = ['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', '2', '3', '4', '5', '6', '7', '8', '9'];

  $len = !$n ? random_int(7, 12) : $n; // Chose length randomly in 7 to 12

  $ddd = array_map(function($a) use ($al){
    $key = random_int(0, 60);
    return $al[$key];
  }, array_fill(0,$len,0));
  return implode('', $ddd);
}

Using range function

range — Create an array containing a range of elements Create an array containing a range of elements.

Using array_rand function

Picks one or more random entries out of an array, and returns the key (or keys) of the random entries. It uses a pseudo random number generator that is not suitable for cryptographic purposes.