Discuss the detailed explanation of multi-key value cookie (cookie access array in php)_PHP tutorial

Cookies cannot store arrays by default, so the following writing is wrong.
The error reported is as follows:
Warning: setcookie() expects parameter 2 to be string, array given in
But PHP can put the same name and end with [] The cookie is parsed as an array. The method to implement cookie storage in php is as follows:

Method 1: Use serialize to serialize the array first, then store it in COOKIE. When reading it out, use unserialize to get the original array

Method 2: Set multi-key values cookie, note that the key value must be

Copy code The code is as follows:

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

Result: All elements of the array are saved.
Array length: 3
Array ( [0] => 1 [1] => 2 [2] => 3 )

The following writing method isError:

Copy code The code is as follows:

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

Result: Only the last element is saved
Array length: 1
Array ( [0] => 3 )

http://www.bkjia.com/PHPjc/327414.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/327414.htmlTechArticleCookies cannot store arrays by default, so the following writing is wrong. The error is as follows: Warning: setcookie() expects parameter 2 to be string, array given in But PHP can put the same name and the last...