The array_change_key_case() function used for changes all keys of array to lowercase or uppercase.
Syntax
array_change_key_case(array,case);
case
Either CASE_UPPER or CASE_LOWER (default)
Example
$age=array("Ram"=>"30","Shyam"=>"32","Ghanshyam"=>"35");
print_r(array_change_key_case($age,CASE_LOWER));
Output
Array ( [ram] => 30 [shyam] => 32 [ghanshyam] => 35 )
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