- array_merge_recursive: documentation ( source)
- print_r: documentation ( source)
<?php
$a1 = array( 'apple'=>1,'banana'=>2,'coconut'=> 3);
$a2 = array( 'apple'=>2,'banana'=>3,'coconut'=> 4);
echo "<pre>";
print_r(array_merge_recursive($a1,$a2));
echo "</pre>";