我尝试将AJAX变量混合到PHP时出现问题

Question

So I'm trying to make the simplest of communications between AJAX and PHP, and send a single variable to my PHP, where it will be stored, but nothing seems to work u_u

This here is my AJAX code

$(document).ready(function() {

 $("#ch1").click(function(){

  document.getElementById('stf').style.visibility="visible";
  document.getElementById('ch2').style.visibility="visible";
  document.getElementById('reto1').src="slides/reto1_completo.png";
  var counter = 1;
  var longform = $("input:text").serialize();
  $.ajax({
   type: GET,
   url: 'counter.php',
   data:   longform + "counter=<?php echo $counter; ?>",
  })
 })
})

And this one here is my PHP

session_start();

$db = mysql_connect("localhost","db","pass");
if(!$db) die("Error");
mysql_select_db("db",$db);

$counter = $_GET['counter'];

$insert = mysql_query("UPDATE usuarios SET retos='$counter' WHERE email = '$correo'") or die(mysql_error());

So this is it, I'm sure it's the simplest of mistakes, but I just can't figure it out. Thanks in advance

Answer 1

You're building your data string wrong. longform will look something like:

foo=bar&baz=qux

which you then tack on the coutner value directly:

foo=bar&baz=quxcounter=$counter

You need a & separator:

   data:   longform + "&counter=<?php echo $counter; ?>",
                       ^---here

so counter will be its own key, not part of the baz value that's at the end of longform.