How to return an array in php

In PHP programming, arrays are a very common and practical data type that can be used to store a series of values, and the elements can be accessed through array subscripts or keys. In some cases, we need an array as the return value of a function for further processing outside the function. This article will introduce how to return an array in PHP.

1. Return an array through the return statement

In PHP, we can use the return statement to use an array as the return value of a function. The specific syntax format is as follows:

function function_name(){
    $array_name = array(元素1,元素2,……);
    return $array_name;
}

Among them, we can assign the array that needs to be returned to a variable $array_name, and use the return statement to return the variable at the end, and the array can be received outside the function.

The following is a sample program that generates an array containing integers from 1 to 100 inside the function, and then returns the array:

function create_numbers_array(){
    $numbers = array();
    for($i=1;$i<=100;$i++){
        $numbers[] = $i;
    }
    return $numbers;
}

$result = create_numbers_array();
print_r($result);

The program output is as follows:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
    [8] => 9
    [9] => 10
    ……
    [99] => 100
)

2. Return an array by passing parameters

In addition to using the return statement to return an array, we can also use the function parameter to return an array to the outside of the function for processing. Specifically, we can pass an existing array into the function's parameters, and then return it after processing it inside the function.

The following is a sample program that first defines an array containing 10 integers, and then defines a function to operate on the array and return the modified array:

//定义一个数组
$numbers = array(1,2,3,4,5,6,7,8,9,10);

//定义一个函数
function double_numbers($arr){
    foreach($arr as $key => $value){
        $arr[$key] = $value * 2;
    }
    return $arr;
}

//调用函数并传递数组作为参数
$new_numbers = double_numbers($numbers);

//输出修改后的数组
print_r($new_numbers);

Program output results As follows:

Array
(
    [0] => 2
    [1] => 4
    [2] => 6
    [3] => 8
    [4] => 10
    [5] => 12
    [6] => 14
    [7] => 16
    [8] => 18
    [9] => 20
)

3. Define the array in the function

Finally, we can define the array directly inside the function and return it to external use at the end of the function. The specific syntax format is as follows:

function function_name(){
    $array_name = array(元素1,元素2,……);
    return $array_name;
}

This method is very similar to the first method. The difference is that the process of array definition and initialization is placed inside the function.

The following is a sample program that generates an array containing 10 random numbers inside the function, and then returns the array:

function get_random_numbers(){
    $random_numbers = array();
    for($i=1;$i<=10;$i++){
        $random_numbers[] = rand(1,100);
    }
    return $random_numbers;
}

$result = get_random_numbers();
print_r($result);

The program output is as follows:

Array
(
    [0] => 66
    [1] => 5
    [2] => 93
    [3] => 96
    [4] => 50
    [5] => 43
    [6] => 74
    [7] => 95
    [8] => 89
    [9] => 26
)

Summary

In PHP, you can return an array in a variety of ways, including using the return statement, parameter passing method, and defining the array directly inside the function. Different methods are suitable for different situations and needs, and developers can choose and use them according to specific business needs.

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