How to convert array key name (key) to lowercase in php

In PHP, you can use the array_change_key_case() function to convert the array key name (key) to lowercase; this function can convert all the keys (keys) in the array to lowercase letters, you only need to omit the first Two parameters or set the second parameter to "CASE_LOWER", the syntax is "array_change_key_case (array)" or "array_change_key_case (array, CASE_LOWER)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

How to convert the array key name (key) in php for lowercase? Simple!

PHP provides a function: array_change_key_case() to achieve this function. Let's take a look at this function

array_change_key_case() The function can convert all keys of the array into uppercase letters or lowercase letters. Syntax format:

array_change_key_case(array,case);

##ParametersDescriptionarrayRequired. Specifies the array to use. caseOptional. Possible values:

	CASE_LOWER - Default value. Convert an array's keys to lowercase letters. CASE_UPPER - Convert array keys to uppercase letters.

Return value: Returns an array with keys with lowercase letters, or returns an array with keys with uppercase letters, or if array is not a Array returns FALSE.

alright! After understanding the array_change_key_case() function, we also know how to convert the array key name (key) to lowercase:

• Just need to set the second parameter of the array_change_key_case() function to " CASE_LOWER", or omit the second parameter.

Implementation code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);  
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
echo "原数组：";
var_dump($age);
echo "数组键名（key）转为小写：";
var_dump(array_change_key_case($age));
var_dump(array_change_key_case($age,CASE_LOWER));
?>

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