Share 3 ways to convert ternary array to uniary array in PHP

A triple array in PHP refers to an array containing multiple elements, where each element itself is a small array containing three values. In some cases, it is necessary to convert such a three-element array into a one-element array, that is, combine all the small arrays into one large array. This article will introduce how to convert a three-element array into a one-element array in PHP.

1. Use the array_map function

The array_map function can perform specified operations on each element in the array and return a new array. We can use the array_map function to convert a three-element array into a one-element array. The specific code implementation is as follows:

<?php
// 定义三元数组
$data = array(
    array(&#39;id&#39; => 1, 'name' => 'John', 'age' => 20),
    array('id' => 2, 'name' => 'Tom', 'age' => 23),
    array('id' => 3, 'name' => 'David', 'age' => 25)
);

// 定义一个回调函数，用于将小数组合并为大数组
function merge_arrays($arr) {
    return array_values($arr);
}

// 使用array_map函数将三元数组转为一元数组
$result = array_map('merge_arrays', $data);

// 输出结果
var_dump($result);
?>

In the above code, we define a three-element array $data, and define a callback function merge_arrays to merge the decimal groups into a large array. Then we call the array_map function and merge_arrays as the callback function. The array_map function passes each element in $data to the merge_arrays function and stores the return value in the $result array. Finally, we use the var_dump function to output the structure of the $result array.

2. Use foreach loop

In addition to the array_map function, we can also use the foreach loop to convert a three-element array into a one-element array. The specific code implementation is as follows:

<?php
// 定义三元数组
$data = array(
    array(&#39;id&#39; => 1, 'name' => 'John', 'age' => 20),
    array('id' => 2, 'name' => 'Tom', 'age' => 23),
    array('id' => 3, 'name' => 'David', 'age' => 25)
);

// 定义一个空数组，用于保存结果
$result = array();

// 循环遍历三元数组
foreach ($data as $arr) {
    $result[] = array_values($arr);
}

// 输出结果
var_dump($result);
?>

In the above code, we define an empty array $result to save the converted results. We then use a foreach loop to iterate through each element in the triple array $data, and use the array_values ​​function to convert the small array to a one-element array, and then add it to the end of the $result array. Finally, we use the var_dump function to output the structure of the $result array.

Summary:

This article introduces two methods of converting a three-element array into a one-element array in PHP: using the array_map function and using the foreach loop. No matter which method is used, you need to define a callback function or loop through the array and merge the small arrays into a large array. Regarding the readability and performance of the code, you can choose the most suitable implementation method according to the specific situation.

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