无法在 PHP 中连接 2 个数组 [英] Can't concatenate 2 arrays in PHP

问题描述

我最近学习了如何在 PHP 中使用 + 运算符连接 2 个数组.

I've recently learned how to join 2 arrays using the + operator in PHP.

但是考虑一下这段代码...

But consider this code...

$array = array('Item 1');

$array += array('Item 2');

var_dump($array);

输出是

array(1) { [0]=> string(6) "项目1" }

array(1) { [0]=> string(6) "Item 1" }

为什么这不起作用?跳过速记并使用 $array = $array + array('Item 2') 也不起作用.跟钥匙有关系吗?

Why does this not work? Skipping the shorthand and using $array = $array + array('Item 2') does not work either. Does it have something to do with the keys?

推荐答案

两者都有一个 0 键，这种组合数组的方法将折叠重复项.尝试使用 array_merge() 代替.

Both will have a key of 0, and that method of combining the arrays will collapse duplicates. Try using array_merge() instead.

$arr1 = array('foo'); // Same as array(0 => 'foo')
$arr2 = array('bar'); // Same as array(0 => 'bar')

// Will contain array('foo', 'bar');
$combined = array_merge($arr1, $arr2);

如果数组中的元素使用不同的键，+ 运算符会更合适.

If the elements in your array used different keys, the + operator would be more appropriate.

$arr1 = array('one' => 'foo');
$arr2 = array('two' => 'bar');

// Will contain array('one' => 'foo', 'two' => 'bar');
$combined = $arr1 + $arr2;

添加了一个代码片段来澄清

Added a code snippet to clarify

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