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array_merge_recursive — Recursively merges all passed values into one array.


array array_merge_recursive(array_1, value_2[, . . .]);
mixed array_1: Base array or value
mixed value_2: Next value or array to merge
mixed . . . (optional): Further values or arrays to merge


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


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.


PHP 4 since 4.0.1

See also

See also array_merge()


Example 23. 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));

    [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


PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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