PHP array_merge() Function: Merging One or More Arrays

array_merge() merges one or more arrays by appending the values of later arrays to the previous ones and returns the resulting array.

If the arrays have identical string keys, later values overwrite earlier ones; numeric keys are reindexed and values are appended.

When only a single numeric-indexed array is provided, the keys are reindexed sequentially.

Parameters

array1 – the initial array to merge.

... – additional arrays to merge recursively.

Return value

Returns the merged array.

Example

<?php
$array1 = array("color"=>"red", 2, 4);
$array2 = array("a", "color"=>"green", "shape"=>"trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?>

Output

Array
(
    [color] => green
    [0] => 2
    [1] => 4
    [2] => a
    [shape] => trapezoid
    [3] => 4
)