array_merge

1、array_merge 中有两个参数：将两个关联数组合并为一个数组

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

运行结果：Array ( [a] => red [b] => yellow [c] => blue )

2、array_merge 中只有一个参数：将数组中下标重拍

<?php
$a=array(3=>"red",4=>"green");
print_r(array_merge($a));
?>　

运行结果：Array ( [0] => red [1] => green )