PHP array 的加法操作代码

发布时间：2020-12-13 05:45:56 所属栏目：PHP教程来源：网络整理

导读：The + operator appends elements of remaining keys from the right handed array to the left handed,whereas duplicated keys are NOT overwritten. 今天再次看 php manual的时候，才知道代码如下: $a = array("a" => "apple","b" => "banana"); $b = a

The + operator appends elements of remaining keys from the right handed array to the left handed,whereas duplicated keys are NOT overwritten. 今天再次看 php manual的时候，才知道

代码如下:

$a = array("a" => "apple","b" => "banana"); 
$b = array("a" => "pear","b" => "strawberry","c" => "cherry"); 
$c = $a + $b; // Union of $a and $b 
echo "Union of $a and $b: n"; 
var_dump($c); 
$c = $b + $a; // Union of $b and $a 
echo "Union of $b and $a: n"; 
var_dump($c); 
?> 

When executed,this script will print the following:
Union of $a and $b:

代码如下:

array(3) { 
["a"]=> 
string(5) "apple" 
["b"]=> 
string(6) "banana" 
["c"]=> 
string(6) "cherry" 
} 
Union of $b and $a: 
array(3) { 
["a"]=> 
string(4) "pear" 
["b"]=> 
string(10) "strawberry" 
["c"]=> 
string(6) "cherry" 
} 

原来，我的理解就是。直接把$b中的元素直接复制到$a中。
我错了。

（编辑：李大同）

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