How to convert array value to lowercase in PHP?

In the article "How does PHP convert array keys to lowercase? ", we will introduce to you the method of converting array keys to lowercase. In this article, we will continue to introduce how to convert array values ​​to lowercase in PHP. Similarly, we can simply implement it by simply using the array_map() function.

Below we will combine simple code examples to introduce PHP's method of converting array values ​​into lowercase .

The code example is as follows:

<?php
$myArray = [&#39;1&#39;=>&#39;Hey&#39;,&#39;2&#39;=>&#39;Hello&#39;,&#39;3&#39;=>&#39;Hi&#39;,&#39;4&#39;=>&#39;GM&#39;];
$result = array_map(&#39;strtolower&#39;,$myArray);
print_r($result);

Output:

Array
(
    [1] => hey
    [2] => hello
    [3] => hi
    [4] => gm
)

Function introduction:

array_map() for each element of the array Apply callback function

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

callback, callback function, applied to each element in each array.

array1, array, traverses and runs the callback function.

...

Array list, each traversing and running the callback function.

Return value, return array, containing all elements of array1 after callback function processing.

This article is an introduction to the method of converting array values ​​to lowercase in PHP. It is simple and easy to understand. I hope it will be helpful to friends in need!

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