하나 이상의 배열을 하나의 배열로 병합하는 PHP 함수 array_merge_recursive()

<?php
$a1=array("a"=>"red","b"=>"green");
$a2=array("c"=>"blue","b"=>"yellow");
print_r(array_merge_recursive($a1,$a2));
?>

array_merge_recursive(array1,array2,array3...)

<?php 
$arr1 = array("color"=>array("favorite"=>"red"),5); 
$arr2 = array(10,"color"=>array("favorite"=>"green","blue")); 
var_dump(array_merge_recursive($arr1,$arr2));
?>

array(3) {
  ["color"]=>
  array(2) {
    ["favorite"]=>
    array(2) {
      [0]=>
      string(3) "red"
      [1]=>
      string(5) "green"
    }
    [0]=>
    string(4) "blue"
  }
  [0]=>
  int(5)
  [1]=>
  int(10)