Examples of php array merging and recursive merging

/**
 desc: array merge
 link: bbs.it-home.org
 date: 2013/2/22
*/
$a = array( 'a' => 1, 'b' => 2 );
$b = array( 'b' => 3, 'd' => 4 );
//Array merge
$array_merge = array_merge( $a, $b );
echo '< ;pre>';
print_r( $array_merge );
//Array recursive merge
$array_merge_recursive = array_merge_recursive( $a, $b );
print_r( $array_merge_recursive );
echo ' ';
?>

output result: Array ( [a] => 1 => 3 [d] => 4 ) Array ( [a] => 1 => Array ( [0] => 2 [1] => 3 )

[d] => 4 )

We can see: When array_merge encounters the same value, the second array key overwrites the first array key, while the array_merge_recursive function uses subscript merging for arrays of the same value.