array_change_key_case
(PHP 4 >= 4.2.0, PHP 5)
array_change_key_case — Changes all keys in an array
說明
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.
參數
- input
-
The array to work on
- case
-
Either CASE_UPPER or CASE_LOWER (default)
Return值
Returns an array with its keys lower or uppercased, or false if input is not an array.
錯誤/例外
Throws E_WARNING if input is not an array.
範例
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));
?>
上例將輸出：
Array ( [FIRST] => 1 [SECOND] => 4 )
註釋
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.