How to generate random array in php

Random arrays are very common in PHP programming and are usually used in various scenarios such as testing, data simulation, custom scripts, and data manipulation. There are many ways to implement random arrays, but this article will focus on how PHP generates random arrays, which is a relatively simple and effective way.

1. Generate a random array using a loop method

You can use the rand function that comes with PHP to generate random numbers. According to the number of random numbers, the random numbers are generated in a loop and then stored in the array. . The specific implementation is as follows:

<?php
function randArray($arrLen,$maxValue){
    $arr = array();
    for($i=0;$i<$arrLen;$i++){
        $arr[$i]=mt_rand(0,$maxValue);
    }
    return $arr;
}

$arrLen = 5;
$maxValue = 20;
$arr = randArray($arrLen,$maxValue);
var_dump($arr);
?>

The running results are as follows:

array(5) {
  [0]=> int(3)
  [1]=> int(10)
  [2]=> int(5)
  [3]=> int(14)
  [4]=> int(6)
}

2. Use the array_fill function to generate a random array

PHP’s array_fill function is a function used to fill an array. Can be used to generate an array of specified length and value. Using its features, you can generate an array of specified length with one line of code.

<?php
$arrLen = 5;
$maxValue = 20;
$arr = array_fill(0, $arrLen, $maxValue);
var_dump($arr);
?>

The running results are as follows:

array(5) {
  [0]=> int(20)
  [1]=> int(20)
  [2]=> int(20)
  [3]=> int(20)
  [4]=> int(20)
}

The arrays generated in the above examples are all fixed-value, but we can add changes in random numbers during generation to change the value of the random array. regularity and scope.

3. Add random factors

Through the above method, we generated arrays with specified lengths and values, but these arrays are a bit too regular and monotonous and do not meet our needs and requirements. .

Below we can add random factors to generate a random array. Different random numbers can be added to the array through the rules and range of random numbers to achieve the purpose of a random array.

<?php

function randArray($arrLen,$minValue,$maxValue){
    $arr = array();
    for($i=0;$i<$arrLen;$i++){
        $arr[$i]=mt_rand($minValue,$maxValue);
    }
    return $arr;
}

$arrLen = 5;
$minValue = 0;
$maxValue = 20;
$arr = randArray($arrLen,$minValue,$maxValue);
var_dump($arr);
?>

The running results are as follows:

array(5) {
  [0]=> int(1)
  [1]=> int(13)
  [2]=> int(9)
  [3]=> int(11)
  [4]=> int(19)
}

The above method can generate random numbers and random arrays within the specified length and range, and realize the positioning and problem diagnosis of code errors and online problems. .

Summary:

There are many ways to generate random arrays in PHP. You can choose different methods according to your needs, including loop methods, array_fill function, and methods to generate high-quality random data. However, it must be used flexibly according to specific needs to achieve better results. It is recommended that when generating random arrays, attention should be paid to the addition of random factors to avoid unnecessary problems and harm in the project.

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