Home >Backend Development >PHP Tutorial >php数组合并的二种方法_PHP

php数组合并的二种方法_PHP

WBOY
WBOYOriginal
2016-06-01 11:55:451013browse

我们首先给出两个数组
复制代码 代码如下:
 $r = array(1,2,3,4,5,6); 
 $e = array(7,8,9,10); 
?>

下面我们用array_merge和加号来何必这两数组
复制代码 代码如下:
print_r($r+e); // 输出Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 )  
print "
"; 
print_r(array_merge($r,$e)); // 输出Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 ) 
?>

从这里可以看出,用array_merge合并数组一个数组中的值附加在前一个数组的后面。返回作为结果的数组如果数组包含数字键名,后面的值将不会覆盖原来的值,而是附加到后面。 然而用加号来合并数组如果键名相同,则取最先出现的数组值,后面的就直接忽略掉

下面我们来改变下前面给出的数组
复制代码 代码如下:
 $r = array('r'=>1,2,3,4,5,6); 
 $e = array('r'=>7,8,9,10); 
?> 

复制代码 代码如下:
print_r($r+e); // 输出Array ( [r] => 1 [0] => 2 [1] => 3 [2] => 4 [3] => 5 [4] => 6 ) 
print "
"; 
print_r(array_merge($r,$e)); // 输出Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 ) 
?> 

从这里可以看出,用array_merge合并数组一个数组中的值附加在前一个数组的后面。如果非数字键名相同,则后面数组的值会覆盖前面数组的值。 然而用加号来合并数组如果键名相同,则取最先出现的数组值,后面的就直接忽略掉

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn