PHP array_change_key_case() function

In this chapter you will learn:

1. Description for PHP array_change_key_case() function
2. Syntax for PHP array_change_key_case() function
3. Parameter for PHP array_change_key_case() function
4. Return value for PHP array_change_key_case() function
5. Example for array_change_key_case() function
6. Example - If two or more keys will be equal after running array_change_key_case()

Description

The array_change_key_case() function changes all keys in an array to lowercase or uppercase.

Syntax

PHP array_change_key_case() function has the following syntax.

Parameter

Possible values for case:

Return

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

Example

Change the lowercase key to uppercase.

<?php
    $age=array("a"=>"a","b"=>"b","c"=>"c");
    print_r(array_change_key_case($age,CASE_UPPER));
?>

The code above generates the following result.

Example 2

If two or more keys will be equal after running array_change_key_case() (e.g. "b" and "B"), the latest array will override the other.

<?php
    $pets=array("a"=>"a","b"=>"b","B"=>"B","A"=>"A");
    print_r(array_change_key_case($pets,CASE_UPPER));
?>

The code above generates the following result.

Next chapter...

What you will learn in the next chapter:

1. Definition of PHP array_chunk() function
2. Syntax for PHP array_chunk() function
3. Parameter for PHP array_chunk() function
4. Return from PHP array_chunk() function
5. Example for PHP array_chunk() function
6. Example - Split Associative arrays

PHP array() function

PHP array_change_key_case() function

PHP array_chunk() function

PHP array_combine() function

PHP array_count_values() function

PHP array_diff() function

PHP array_diff_assoc() Function

PHP array_diff_key() function

PHP array_diff_uassoc() function

PHP array_diff_ukey() function

PHP array_fill() function

PHP array_fill_keys() function

PHP array_filter() function

PHP array_flip() function

PHP array_intersect() Function

PHP array_intersect_assoc() Function

PHP array_intersect_key() function

PHP array_intersect_uassoc() Function

PHP array_intersect_ukey() Function

PHP array_key_exists() Function

PHP array_keys() function

PHP array_map() Function

PHP array_merge() function

PHP array_merge_recursive() Function

PHP array_multisort() Function

PHP array_pad() Function

PHP array_pop() function

PHP array_product() Function

PHP array_push() function

PHP array_rand() function

PHP array_reduce() Function

PHP array_replace() Function

PHP array_replace_recursive() Function

PHP array_reverse() Function

PHP array_search() Function

PHP array_shift() Function

PHP array_slice() Function

PHP array_splice() Function

PHP array_sum() Function

PHP array_udiff() Function

PHP array_udiff_assoc() Function

PHP array_udiff_uassoc() Function

PHP array_uintersect() Function

PHP array_uintersect_assoc() Function

PHP array_uintersect_uassoc() Function

PHP array_unique() Function

PHP array_unshift() Function

PHP array_values() Function

PHP array_walk() Function

PHP array_walk_recursive() Function

PHP arsort() Function

PHP asort() Function

PHP compact() Function

PHP count() Function

PHP current() Function

PHP each() Function

PHP end() Function

PHP explode() Function

PHP extract() Function

PHP implode() Function

PHP in_array() Function

PHP key() Function

PHP krsort() Function

PHP ksort() Function

PHP list() Function

PHP natcasesort() Function

PHP natsort() Function

PHP next() Function

PHP pos() Function

PHP prev() Function

PHP range() Function

PHP reset() Function

PHP rsort() Function

PHP shuffle() Function

PHP sizeof() Function

PHP sort() Function

PHP uasort() Function

PHP uksort() Function

PHP usort() Function