PHP合并两个或多个数组的方法

<?php

header("content-type:text/html;charset=utf-8");

$x = array("red", "green","orange"); 

$y = array("red","blue","yellow","cyan"); 

$z = $x + $y; // $x 与 $y 的联合

var_dump($z);

?>

<?php

header("content-type:text/html;charset=utf-8");

$x = array("a" => "red", "b" => "green"); 

$y = array("c" => "blue", "d" => "yellow"); 

$z = $x + $y; // $x 与 $y 的联合

var_dump($z);

?>

<?php

header("content-type:text/html;charset=utf-8");

$x = array("0" => "red", "1" => "green","2" => "yellow"); 

$y = array("3" => "blue", "2" => "yellow","1" => " orange"); 

$z = array_merge($x, $y); // $x 与 $y 的联合

var_dump($z);

?>

<?php

header("content-type:text/html;charset=utf-8");

$x = array("0" => "red", "1" => "green","2" => "yellow"); 

$y = array("3" => "blue", "2" => "yellow","1" => " orange"); 

$z = array_merge_recursive($x, $y); // $x 与 $y 的联合

var_dump($z);

?>