PHP array 的加法操作代码

2019-11-22 01:07:49

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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

复制代码代码如下:

 
<?php 
$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:

复制代码代码如下:

 
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" 
} 