PHP array_change_key_case () function
Examples
All key array converted to uppercase letters:
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_UPPER));
?>
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_UPPER));
?>
Running instance »
Definition and Usage
array_change_key_case () all of the key functions of the array are converted to uppercase or lowercase letters.
grammar
array_change_key_case( array , case );
参数 | 描述 |
---|---|
array | 必需。规定要使用的数组。 |
case | 可选。可能的值:
|
technical details
return value: | Returns an array of keys with lowercase letters, or return an array of keys with a capital letter, or if the array is not an array returns FALSE. |
---|---|
PHP version: | 4.2+ |
More examples
Example 1
All key array converted to lowercase:
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_LOWER));
?>
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
print_r(array_change_key_case($age,CASE_LOWER));
?>
Running instance »
Example 2
If you run End array_change_key_case () after two or more of the same key (for example, "b" and "B"), the last element will cover other elements:
<?php
$pets=array("a"=>"Cat","B"=>"Dog","c"=>"Horse","b"=>"Bird");
print_r(array_change_key_case($pets,CASE_UPPER));
?>
$pets=array("a"=>"Cat","B"=>"Dog","c"=>"Horse","b"=>"Bird");
print_r(array_change_key_case($pets,CASE_UPPER));
?>
Running instance »
Complete PHP Array Reference