php array_merge what does it do code example

Example 1: php array_merge

 "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?>
Array
(
    [color] => green
    [0] => 2
    [1] => 4
    [2] => a
    [3] => b
    [shape] => trapezoid
    [4] => 4
)

Example 2: merge array in php

$a1=array("red","green");
$a2=array("blue","green","yellow");
print_r(array_merge($a1,$a2));

Example 3: array_merge

Combina los elementos de uno o más arrays juntándolos de modo que los valores de uno se anexan al final del anterior. Retorna el array resultante.