Merge two associative arrays into one array in PHP

Description

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

Example

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

The code above generates the following result.