Question

How to change the case of all keys in an array in PHP

Answer 1

$arr = array("a" => "PHP", "b" => "C++", "c" => "Java");

$arr = array_change_key_case($arr, CASE_UPPER); 
    
print_r($arr)
 
/*
run:

Array ( [A] => PHP [B] => C++ [C] => Java ) 

*/

 

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Answer 2

$arr = array("A" => "PHP", "B" => "C++", "C" => "Java");

$arr = array_change_key_case($arr, CASE_LOWER); 
    
print_r($arr)
 
/*
run:

Array ( [a] => PHP [b] => C++ [c] => Java )  

*/

 

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