array_merge_recursive

array array_merge_recursive(mixed value_1, mixed value_2, mixed ...) 

value_1	Base array or value
value_2	Next value or array to merge
...	Further values or arrays to be merged

Recursively merges all passed values into one array.

Returns:

Array containing the results of merging all passed values; NULL on failure

Description:

This function is like array_merge() except that identically-keyed nested arrays are recursed through and merged with each other, just as though array_merge() had been called on them.

Version:

PHP 4 since 4.0.1

See also:

array_merge() 

Example:

Recursively merge arrays

$ax = array("a" => "alpha", "b" => "bravo", 
           "z" => array("c" => "charlie", "d" => "delta")); 
$ay = array("t" => "tango", "u" => "uniform", "v" => "victor", 
           "z" => array("w" => "whiskey", "x" => "x-ray")); 
$az = array("lima", "mike", "november", 
           "not_z" => array("Bill" => "Cat", "Rosebud" => "basselope")); 
print_r(array_merge_recursive($ax, $ay, $az)); 

Output: 
Array 
(
    [a] => alpha 
    [b] => bravo 
    [z] => Array 
        (
            [c] => charlie 
            [d] => delta 
            [w] => whiskey 
            [x] => x-ray 
        ) 
    [t] => tango 
    [u] => uniform 
    [v] => victor 
    [0] => lima 
    [1] => mike 
    [2] => november 
    [not_z] => Array 
        (
            [Bill] => Cat 
            [Rosebud] => basselope 
        ) 
)