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PHP array 的加法操作说明(二个数组执行+操作) - 站长搜索
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PHP array 的加法操作说明(二个数组执行+操作)

PHP 2014-12-24 19:21:17 转载来源: 网络整理/侵权必删

本文为大家讲解的是PHP array 的加法操作说明(二个数组执行+操作),感兴趣的同学参考下。 PHP array 的加法操作过程中的一个问题,大家可以继续往下看

本文为大家讲解的是PHP array加法操作说明(二个数组执行+操作),感兴趣的同学参考下。

PHP array 的加法操作过程中的一个问题,大家可以继续往下看。

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


<?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:

输出如下:

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。

 

 


标签: PHP array 加法 操作说明 二个 数组 执行 操作


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