array_change_key_case() function in PHP

The array_change_key_case returns an array with all keys in lowercase or uppercase. It returns an array with its keys in lowercase or uppercase. It returns FALSE if array is not an array.

Syntax

array_change_key_case(arr,case)

Parameters

• arr − The array. Required.

• case − Specify the case. The default is Lowercase i.e. CASE_LOWER. Optional.

Return

The array_change_key_case() function returns an array with its keys in lowercase or uppercase. It returns FALSE if array is not an array.

The following is an example to convert all keys to uppercase.

Example

Live Demo

<?php
   $vehicle = array("b"=>"Bus","t"=>"Truck");
   print_r(array_change_key_case($vehicle,CASE_UPPER));
?>

Output

Array
(
   [B] => Bus
   [T] => Truck
)

The following is an example to convert all keys to lowercase.

Example

Live Demo

<?php
   $vehicle = array("C"=>"Car","T"=>"Bike");
   print_r(array_change_key_case($vehicle,CASE_LOWER));
?>

Output

Array
(
   [c] => Car
   [t] => Bike
)

Samual Sam

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Updated on: 30-Jul-2019

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