PHP：添加阵列一起 [英] PHP: Adding arrays together

问题描述

有人能帮助我解释一下吗？我有code两个片段，一期工程如我所料，但对方却没有。

Could someone help me explain this? I have two snippets of code, one works as I expect, but the other does not.

这工作

$a = array('a' => 1, 'b' => 2);
$b = array('c' => 3);
$c = $a + $b;
print_r($c);

// Output
Array
(
    [a] => 1
    [b] => 2
    [c] => 3
)

这不

$a = array('a', 'b');
$b = array('c');
$c = $a + $b;
print_r($c);

// Output
Array
(
    [0] => a
    [1] => b
)

这是怎么回事？上为什么没有第二个版本还添加了两个数组在一起吗？我有什么误解？我应该怎么做呢？或者是在PHP中的错误？

What is going on here?? Why doesn't the second version also add the two arrays together? What have I misunderstood? What should I be doing instead? Or is it a bug in PHP?

推荐答案

这是记载和正确的：<一href=\"http://us3.php.net/manual/en/language.operators.array.php\">http://us3.php.net/manual/en/language.operators.array.php

+运算符追加其余按键的元素从右手阵交到左侧，但是重复的键值不会被覆盖。

The + operator appends elements of remaining keys from the right handed array to the left handed, whereas duplicated keys are NOT overwritten.

所以，我想这不是在PHP中的错误，什么是假设发生。我没有注意到在此之前无论是。

So I guess it's not a bug in php and what is suppose happen. I hadn't noticed this before either.

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