PHP array_change_key_case() Function
Complete PHP Array Reference
Definition and Usage
The array_change_key_case() function returns an array with all array KEYS in lower case or upper case.
Syntax
array_change_key_case(array,case)
|
| Parameter |
Description |
| array |
Required. Specifies the array to use |
| case |
Optional. Possible values:
- CASE_LOWER - Deafult value. Returns the array key values in lower case.
- CASE_UPPER - Returns the array key values in upper case.
|
Tips and Notes
Note: If two or more array keys will be the same after running this function,
the last array will override the others. (See example 2)
Example 1
<?php
$a=array("a"=>"Cat","b"=>"Dog","c"=>"Horse");
print_r(array_change_key_case($a,CASE_UPPER));
?>
|
The output of the code above will be:
Array ( [A] => Cat [B] => Dog [C] => Horse )
|
Example 2
<?php
$a=array("a"=>"Cat","b"=>"Dog","c"=>"Horse","B"=>"Bird");
print_r(array_change_key_case($a,CASE_UPPER));
?>
|
The output of the code above will be:
Array ( [A] => Cat [B] => Bird [C] => Horse )
|
Complete PHP Array Reference
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