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探讨多键值cookie(php中cookie存取数组)的详解_php技巧

WBOY
WBOYOriginal
2016-05-17 09:02:53920browse

cookie默认不能存数组,所以下面的写法是错误的。
报错如下:
Warning: setcookie() expects parameter 2 to be string, array given in
但是PHP可以把同名且后面以[]结尾的cookie解析为数组。在php里面实现cookie存数组的方法如下:

方法一:先用serialize序列化数组,再存入COOKIE   ,读出来时用unserialize得到原来的数组

方法二:设定多键值cookie,注意必须给键值

复制代码 代码如下:

$arr = array(1,2,3);  
setcookie("a[0]", $arr[0]);  
setcookie("a[1]", $arr[1]);  
setcookie("a[2]", $arr[2]); 

结果:数组所有元素都存到了。
数组长度 :3
Array ( [0] => 1 [1] => 2 [2] => 3 )

以下写法是错误的:
复制代码 代码如下:

$arr = array(1,2,3);  
setcookie("a[]", $arr[0]);  
setcookie("a[]", $arr[1]);  
setcookie("a[]", $arr[2]); 

结果:只存了最后一个元素
数组长度 :1
Array ( [0] => 3 )
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