PHP array_replace_recursive() Function

• If a key from the first array exists in the second array, then the value corresponding to that key of the first array will be replaced by the value of the second array.
• If the key exists in the second array but not in the first array then it will be created in the first array.
• If a key only exists in the first array then it will be left as it is.
• If several arrays are passed for replacement, they will be processed in order, the later array overwriting the previous values.

array_replace_recursive($array1, $array2, $array3...)

Input: $array1 = array("a"=>array("red"), 
                       "b"=>array("green"));
       $array2 = array("a"=>array("yellow"), 
                       "b"=>array("black"));
Output: Array ( 
                [a] => Array ( [0] => yellow ) 
                [b] => Array ( [0] => black  ) 
              )

<?php
// PHP program to illustrate array_replace_recursive() 
// function
$array1 = array( "a" => array("red"), 
            "b" => array("green", "blue"));
$array2=array( "a" => array("yellow"), 
                    "b" => array("black"));
$array3=array("a" => array("orange"), 
                 "b" => array("burgundy"));
print_r(array_replace_recursive($array1, $array2, $array3));
?>

Array
(
    [a] => Array
        (
            [0] => orange
        )

    [b] => Array
        (
            [0] => burgundy
            [1] => blue
        )

)