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@ 2017-07-04T14:57:22Z

<?php

$arr1= array('a' => "XL");  
$arr2= array('a' => "XLd",'b'=>"CDW");

array_walk(
    $arr2, 
    function(&$val,$key) use ($arr1){
        if(isset($arr1[$key])){
            $val = $arr1[$key];
        } else {
            $val = '';
        }
    }
);

print_r($arr2);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_walk: documentation ( source)

preferences:dark modelive previewkey bindings

23.55 ms | 405 KiB | 5 Q