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PHP: array_change_ key_case() function

PHP: Changes the case of all keys in an array

The array_change_key_case() function is used to change all keys of a given array to lower case or upper case.

Version:

(PHP 4 and above)

Syntax:

array_change_key_case (input_array, input_case)

Parameters:

Name Description Required /
Optional
Type
input_array Specifies the array to work with. Required Array
input_case Either CASE_UPPER or CASE_LOWER.
Default value : CASE_LOWER
Optional Integer

Return value:

An array with its keys lowercased or uppercased. Returns FALSE if the input is not an array.

Value Type: Array

Example:

<?php
$input_array = array("India"=> 100,"China" => 125);
print_r(array_change_key_case($input_array,CASE_UPPER));
?>

Output :

Array  ( [INDIA] => 100 [CHINA] => 125  )

Pictorial Presentation:

php function reference: array_change_ key_case() function

View the example in browser

Practice here online :

See also

PHP Function Reference

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Next: array_chunk



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