Pass Dynamic Parameter from JavaScript to PHP via AJAX for Use in cURL Call -

i using php curl make http long polling request javascript using ajax. here call javascript

var i; i++; $.ajax({    url:"http://localhost/myport.php",    type: get,    success: function(response){ ...},    ...    ... 

here how make php call in myport.php file

 <?php  $ch=curl_init();  $curl_setopt($ch, curlopt_url, "http://localhost:7555/test?index=" //here need set value (the variable i) in above js 

if making call directly js, do

$.ajax({ url:"http://localhost:7555/test?index=" + 

i new php , curl, wondering how can pass value of variable can parameter call.

if understand correctly, , want append value of variable $i curl call, you'd this:

<?php $ch=curl_init(); curl_setopt($ch, curlopt_url, "http://localhost:7555/test?index=" . $i); 

or even,

curl_setopt($ch, curlopt_url, sprintf("http://localhost:7555/test?index=%d", $i)); 

also note hat there no $ before function call: it's curl_setopt() not $curl_setopt() ($ variables, $ch).

edit

upon clarification of question, seems need i variable javascript php. can pass get parameter in ajax call:

var i; i++; $.ajax({    url:"http://localhost/myport.php?index=" + i,    type: get,    success: function(response){ ...},    ...    ... 

then, php, can use this:

curl_setopt($ch, curlopt_url, sprintf("http://localhost:7555/test?index=%d", $_get['index'])); 

you should verify $_get['index'] passed in:

if (!isset($_get['index'])) {     die("the index not specified!"); }