How to randomly generate non-repeating letters in php

How to randomly generate non-repeating letters in php: 1. Create a PHP sample file; 2. Use the for statement to loop from 0 to 5000. Each time a number is looped, a 12-digit number composed of letters is generated. Random code; 3. Randomly replace the numbers in the same order with the random code of letters.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

How to randomly generate non-repeating letters in php?

Random code is a randomly generated sequence of characters, which is used in many places in web design. In PHP, how to generate a large number of non-repeating random codes? For example, generate 5,000 12-digit random codes composed of alphanumeric characters, and these 5,000 random codes cannot be repeated.

There are many ways to generate specific numbers. The method used here is the method of unique numerical random letters. The specific method is: loop from 0 to 5000, and each time a number is cycled, a 12-digit random number composed of letters is generated. code, and then randomly replace the numbers in the same sequence into the random code of letters.

The attached code is as follows:

$activecode = array();
$len = 12;
$str = ‘abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ’;
for($i=0;$i<5000;$i++){
    $code = str_shuffle($str);
    $code = substr($code, 0, $len);
    $num = strval($i);
    $num_len = strlen($num);
    $p = -1;
    for($j=0;$j<$num_len;$j++){
        $p = rand($p+1, ($len-1)-($num_len-$j-1));
        $code[$p] = $num[$j];
    }
    $activecode[] = $code;
}
print_r($activecode);

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