Regarding the use of functions such as array_map() in the PHP framework

• There are always some special needs, so I found this function.

• The following is excerpted from the official manual array_map()

• callback -- callback function, applied to each each element in the array.

• array1 -- Array, traverse and run the callback function.

• Array list, each traverses and runs the callback function.

• array_map -- Apply a callback function to each element of the array

• array array_map ( callable $callback , array $array1 [, array $ ... ] )

• array_map(): Returns an array, which is the array after applying the callback function to each element of array1. The number of callback function parameters and the number of arrays passed to array_map() must be the same.

• Parameters

• Return value -- Returns an array containing all elements of array1 after the callback function is processed.

• Example

##

<?php
    $arr = [
        [&#39;a&#39; => &#39;aa&#39;,&#39;b&#39; => &#39;bb&#39;,],
        [&#39;c&#39; => &#39;cc&#39;,&#39;d&#39; => &#39;dd&#39;,],
        [&#39;e&#39; => &#39;ee&#39;,&#39;f&#39; => &#39;ff&#39;,],
    ];

    function test($v){        
    $v[&#39;add&#39;] = 0;
        return $v;
    }    $arr = array_map("test",$arr);
    print_r($arr);?>

Output result

Array(
    [0] => Array
        (
            [a] => aa            
            [b] => bb            
            [add] => 0
        )

    [1] => Array
        (
            [c] => cc            
            [d] => dd            
            [add] => 0
        )

    [2] => Array
        (
            [e] => ee            
            [f] => ff            
            [add] => 0
        ))

• Framework (ThinkPHP) example

<?php
namespace User\Controller;

use Common\Controller\ManagerController;

class DataController extends Controller
{
    public function get_data()
    {
        $arr = [
            // 数据填充
        ];
        
        $arr = array_map([$this,&#39;_add_param&#39;],$arr);
        dump($arr);
    } 

    private function _add_param($value){
        $value[&#39;add&#39;] = &#39;xxx&#39;;
        return $value;
    }
}

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