PHP array_change_key_case() Function
PHP Array Reference
Example
Change all keys in an array to uppercase:
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_UPPER));
?>
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Definition and Usage
The array_change_key_case() function changes all keys in an array to lowercase or uppercase.
Syntax
array_change_key_case(array,case);
Parameter |
Description |
array |
Required. Specifies the array to use |
case |
Optional. Possible values:
- CASE_LOWER - Default value. Changes the keys to lowercase
- CASE_UPPER - Changes the keys to uppercase
|
Technical Details
Return Value: |
Returns an array with its keys in lowercase or uppercase, or
FALSE if array is not an array |
PHP Version: |
4.2+ |
More Examples
Example 1
Change all keys in an array to lowercase:
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_LOWER));
?>
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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
$pets=array("a"=>"Cat","B"=>"Dog","c"=>"Horse","b"=>"Bird");
print_r(array_change_key_case($pets,CASE_UPPER));
?>
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