寻求数组追加的函数，读array_merge()函数文档之时，发现可用多个数组之间可直接用加号，来完成数组追加的想法。
详见：
<?php
$array1 = array();
$array2 = array(1 => "data");
$result = $array1 + $array2;
?>
Array
(
[1] => data
)
原文如下(大概的意思就是可以直接以加号(+)来实现数组追加，不会覆盖):
If you want to completely preserve the arrays and just want to append them to each other (not overwriting the previous keys), use the + operator.
