php man page for array_change_key_case

ARRAY_CHANGE_KEY_CASE(3)						 1						  ARRAY_CHANGE_KEY_CASE(3)

array_change_key_case - Changes the case of all keys in an array

SYNOPSIS
       array array_change_key_case (array  $array, [int  $case = CASE_LOWER])

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

PARAMETERS
	      o $array
		- The array to work on

	      o $case
		- Either CASE_UPPER or CASE_LOWER (default)

RETURN VALUES
	Returns an array with its keys lower or uppercased, or FALSE if $array is not an array.

ERRORS
/EXCEPTIONS
	Throws E_WARNING if $array is not an array.

EXAMPLES
       Example #1

	      array_change_key_case(3) 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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