PHP array 的加法操作代码

2025-01-15 阅读 206 评论 8 点赞 138

摘要：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: when executed, this script will print the follo

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" 
} 