PHP array change key case

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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

Pictorial Presentation :

php array change key_case function

Example :

  1. $input_array = array("India"=> 100,"China" => 125);  

  2. print_r(array_change_key_case($input_array,CASE_UPPER));  

  3. ?>  

Output :

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