Recursively change case and append a character to all keys and values of a multidimensional array

Question

I have the following PHP array:

$data = array(
    'data' => array(
        'first_key' => 'first_value',
        'second_key' => 'second_value',
        'third_key' => 'third_value',
        'fourth_key' => array(
            'mini_first' => 'mini_value'
        )
    )
);

I need to apply filters to the keys and values. For simplicity's sake, I need to convert to uppercase and add another character:

$data = array(
    'DATA' => array(
        'FIRST_KEYx' => 'FIRST_VALUEx',
        'SECOND_KEYx' => 'SECOND_VALUEx',
        'THIRD_KEYx' => 'THIRD_VALUEx',
        'FOURTH_KEYx' => array(
            'MINI_FIRSTx' => 'MINI_VALUEx'
        )
    )
);

Suppose you don't know how many array levels the array will have. How can I solve this?

Answer 1

I think this is right:

<?php


$data = array(
    'data' => array(
        'first_key' => 'first_value',
        'second_key' => 'second_value',
        'third_key' => 'third_value',
        'fourth_key' => array(
            'mini_first' => 'mini_value'
        )));



function convert($array){

$new = array();
foreach($array as $key => $value){
    if(is_array($value)){

        $new[strtoupper($key)."x"] = convert($value);
    }else{

        $new[strtoupper($key)."x"] = strtoupper($value)."x";
    }
}

return $new;

}


print_r(convert($data));

demo: http://codepad.viper-7.com/L9Pow1