How to generate non-repeating random numbers in php

This is nothing to talk about; let’s go straight to the topic and let’s talk about the idea;

The first thing is to use the mt_rand() function to generate a specified number of random numbers;

Then use the array_unique() function to remove duplicates; (Recommended learning: PHP programming from entry to proficiency)

Because of duplicate removal ; so the number obtained is not enough for the specified number;

So, The core is to use a while loop; until the specified number of numbers is obtained;

Go here It can basically be over;

For those who pursue perfection; you can also use sort();

The purpose is not to use for sorting; the main purpose is to format the obtained array key Change;

Let’s talk in code; as follows;

/**
 * 生成不重复的随机数
 * @param  int $start  需要生成的数字开始范围
 * @param  int $end    结束范围
 * @param  int $length 需要生成的随机数个数
 * @return array       生成的随机数
 */
function get_rand_number($start=1,$end=10,$length=4){
    $connt=0;
    $temp=array();
    while($connt<$length){
        $temp[]=mt_rand($start,$end);
        $data=array_unique($temp);
        $connt=count($data);
    }
    sort($data);
    return $data;
}

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