PHP batch randomly generates numbers without duplication

PHP random number batch generation:

Use the rand() function in PHP to generate random numbers, and then determine whether the random number already exists. If it does not exist, it will This random number is stored in an array. Repeat this method multiple times to generate random numbers in batches without repetition.

/**
 * 随机多个数字，可设定是否重复
 * @param int $min          
 * @param int $max          
 * @param int $num          
 * @param boolean $re           
 * @return array
 */
function randomNums($min, $max, $num, $re = false)
{
    $arr = array ();
    $t = 0;
    $i = 0;
    // 如果数字不可重复，防止无限死循环
    if (! $re)
    {
        $num = min($num, $max - $min + 1);
    }
    do
    {
        // 取随机数
        $t = mt_rand($min, $max);
        if (! $re && isset($arr[$t]))
        {
            // 数字重复
            continue;
        }
        $arr[$t] = $t;
        ++ $i;
    }
    while ($i < $num);
    return $arr;
}

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