Merge two arrays into one array recursively in PHP

Description

The following code shows how to merge two arrays into one array recursively.

Example

//from w  ww.j a  va 2s  .co  m
<?php
    $a1=array("a"=>"red","b"=>"green");
    $a2=array("c"=>"blue","b"=>"yellow");
    print_r(array_merge_recursive($a1,$a2));
?>

The code above generates the following result.