array_merge 和 array + array 有什么区别?
问题描述：
一个相当简单的问题.有什么区别:
A fairly simple question. What's the difference between:
$merged = array_merge($array1, $array2);
和
$merged = $array1 + $array2;
?
答
区别在于:
+ 运算符采用两个数组的联合，而 array_merge 函数采用联合但重复键被覆盖.
The + operator takes the union of the two arrays, whereas the array_merge function takes the union BUT the duplicate keys are overwritten.