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array_change_key_case

PHP Manual
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array_change_key_case

(PHP 4 >= 4.2.0, PHP 5)

array_change_key_case -- Changes all keys in an array

Description

array array_change_key_case ( array input [, int case] )

Returns an array with all keys from input lowercased or uppercased. Numbered indices are left as is.

Parameters

input: The array to work on
case: Either CASE_UPPER or CASE_LOWER (default)

Return Values

Returns an array with its keys lower or uppercased, or false if input is not an array.

Errors/Exceptions

Throws E_WARNING if input is not an array.

Examples

Example 1. array_change_key_case() example


<?php
$input_array = array("FirSt" => 1, "SecOnd" => 4);
print_r(array_change_key_case($input_array, CASE_UPPER));
?>

The above example will output:

Array
(
    [FIRST] => 1
    [SECOND] => 4
)

Notes

Note: If an array has indices that will be the same once run through this function (e.g. "keY" and "kEY"), the value that is later in the array will override other indices.

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