Php array change key case
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PHP function array_change_key_case
This function changes all keys in an array to upper case or lower case.
Syntax array_change_key_case
- array: array
- case: CASE_LOWER (for lower case), CASE_UPPER (for upper case)
array_change_key_case(array, case);
Note
- This function accept the array as an associative array. If you use the normal array, you need to modify the array and turn it to associative array.
Example 1: change array key to upper case
<?php
$city = array('usa' => 'New York',
'cambodia' => 'Phnom Penh',
'thailand' => 'Bangkor',
'china' => 'Hong Kong',
'new zealand' => 'Auckland');
print_r(array_change_key_case($city, CASE_UPPER));
?>
Output
Array
(
[USA] => New York
[CAMBODIA] => Phnom Penh
[THAILAND] => Bangkor
[CHINA] => Hong Kong
[NEW ZEALAND] => Auckland
)
Example 2: change array key to lower case
<?php
$city = array('USA' => 'New York',
'CAMBODIA' => 'Phnom Penh',
'THAILAND' => 'Bangkor',
'CHINA' => 'Hong Kong',
'NEW ZEALAND' => 'Auckland');
$city = array_change_key_case($city, CASE_LOWER);
print_r($city);
?>
Output
Array
(
[usa] => New York
[cambodia] => Phnom Penh
[thailand] => Bangkor
[china] => Hong Kong
[new zealand] => Auckland
)
Example 3: change the normal array to lower case
- You need to use array_flip() function to flip the array before you can use
array_change_key_case. After the final result, you can flip it back.
<?php
$city = array('New York',
'Phnom Penh',
'Bangkor',
'Hong Kong',
'Auckland');
$city = array_flip($city);
$city = array_change_key_case($city, CASE_LOWER);
print_r($city);
?>
Output
Array
(
[new york] => 0
[phnom penh] => 1
[bangkor] => 2
[hong kong] => 3
[auckland] => 4
)
Related Links
- array_change_key_case
- array_chunk
- array_combine
- array_count_values
- array_diff_assoc
- array_diff_key
- array_diff_uassoc
- array_diff_ukey
- array_diff
- array_fill_keys
- array_fill
- array_filter
- array_flip
- array_intersect_assoc
- array_intersect_key
- array_intersect_uassoc
- array_intersect_ukey
- array_intersect
- array_key_ exists
- array_keys
