单击锚点时如何存储cookie

Question

I am counting the clicks on anchors and store the number of clicks in a .txt file. When click on an anchor, the number increases by 1. I am not using a user management system, so to prevent multiple clicks on an anchor by a user, i need to store a cookie. But i do have multiple anchors. If a user clicks on anchor 1, the number of click events on anchor 1 increases by 1. He should not have the possibility to click a second time on anchor 1, at least: it should not increase by 1 anymore. But for that user, he still must be able to click on anchor 2 and anchor 3 and it should increase with 1. And after this, also these anchors should not increase by 1 anymore when user clicks on it.

How can i achieve this?

This is my html;

<?php
$clickcount = explode("
", file_get_contents('counter.txt'));
foreach($clickcount as $line){
$tmp = explode('||', $line);
$count[trim($tmp[0])] = trim($tmp[1]);
}

?>

<a href="#count" class="click-trigger" data-click-id="count1">Like</a> 
<span class="click-count"><?php echo $count['count1'];?></span> likes.

<a href="#count" class="click-trigger" data-click-id="count2">Like</a> 
<span class="click-count"><?php echo $count['count2'];?></span> likes.

<a href="#count" class="click-trigger" data-click-id="count3">Like</a> 
<span class="click-count"><?php echo $count['count3'];?></span> likes.

The js:

$(document).on('click', '.click-trigger', function()
{
   var data = {'id':$(this).attr('data-click-id')};
   var count = $(this).next(".click-count");


   $.ajax({
   type : 'POST',
   url  : 'counter.php',
   data : data,
   success :  function(data)
       {                                                
            $(".click-count").fadeIn(500).show(function()
            {
                count.html(data);

            });                     
       }
   });
   return false;
 });

And this is file counter.php

$file = 'counter.txt'; // path to text file that stores counts
$fh = fopen($file, 'r+');
$id = $_REQUEST['id']; // posted from page
$lines = '';
while(!feof($fh)){
   $line = explode('||', fgets($fh));
   $item = trim($line[0]);
   $num = trim($line[1]);
   if(!empty($item)){
     if($item == $id){
       $num++; // increment count by 1
       echo $num;

     }
     $lines .= "$item||$num
";
   }
 } 
 file_put_contents($file, $lines);
 fclose($fh);

The file counter.txt looks like this:

count1||36
count2||124
count3||12

Answer 1

You can use serialize on an array of item numbers when setting the cookie value from php, and unserialize when reading the cookie. You will get an array of integers and can check with in_array whether the user has already clicked the link.