从php读取JavaScript cookie

Question

I have a task which is compare up to five products from the product list. For that I have followed following steps:

step 1:

set onclick event when we click add to compare button of each product. In this event I have set cookie by javascript using this code.

// cookie is set by array because of we have to store 1 to 5 products
var comparearray  = [productid];
document.cookie = "compareitem" + "=" + comparearray;

It is successfully set the cookie value which holds product id of those are selected to compare.

Step 2: In my PHP file I have tried to retrieve this cookie value.BY,

$cookie_val = $_COOKIE['compareitem '];

But it is not worked. I don't know this kind of concept is worth. If know, give me the instructions how to solve my problem. Thanks in advance.

Answer 1

Since some people are writing that you can't use cookies set with JS in PHP, I'm going to answer that question now.

Please try to use a cookieSet and cookieGet function, you can use the one from this answer: How do I create and read a value from cookie?

var createCookie = function(name, value, days) {
    var expires;
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        expires = "; expires=" + date.toGMTString();
    }
    else {
        expires = "";
    }
    document.cookie = name + "=" + value + expires + "; path=/";
}

Note the last parameter which is written into the cookie.. the path-param is set to '/', so the root location! Use a php script in the root location, so that both use the root location and not some other location.

Next please try to stringify the array with JSON.

var cookiedata = JSON.stringify(comparearray);

Then you should be able to get the cookie with PHP and parse the JSON to get the array back.

Answer 2

Since it may be problem with path I suggest to set/get cookie with extended way:

document.cookie="foo=bar; path=/;"

or you can use this function:

function setCookie (name, value, expires, path, domain, secure) {
      document.cookie = name + "=" + escape(value) +
        ((expires) ? "; expires=" + expires : "") +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        ((secure) ? "; secure" : "");
}