replace array keys with given respective keys

Question

I have an array like below

$old = array(
       \'a\' => \'blah\',
       \'b\' => \'key\',
       \'c\' => \'amazing\',
       \'d\' => array(
          


        

Answer 1

I just solved this same problem in my own application, but for my application $keyReplaceInfoz acts like the whitelist- if a key is not found, that whole element is removed from the resulting array, while the matching whitelisted keys get translated to the new values.

I suppose you could apply this same algorithm maybe with less total code by clever usage of array_map (http://php.net/manual/en/function.array-map.php), which perhaps another generous reader will do.

function filterOldToAllowedNew($key_to_test){       
    return isset($keyReplaceInfoz[$key_to_test])?$keyReplaceInfoz[$key_to_test]:false;
}   

$newArray = array();

foreach($old as $key => $value){
    $newkey = filterOldToAllowedNew($key);
    if($newkey){
       $newArray[$newkey] = $value;
    }
}

print_r($newArray);