How to write in a text file by calling php script via javascript -

i beginner in php. uploaded text file on server , want write information within file using php. code working when run using xampp locally.

first call script using ajax (index.html):

$.ajax({     url: 'register.php',     success: function (data) {         // executed when ajax call finished         window.location = "general.html";     },     error: function (xhr, status, error) {         // executed if went wrong during call         if (xhr.status > 0) alert('got error: ' + status); // status 0 - when load interrupted     } }); 

then write information using php script:

<?php $myfile = fopen("user_information.txt", "a") or die("unable open file!"); $txt1 = file_get_contents("user_information.txt"); $ip = get_client_ip_server(); $txt2 = $_cookie["username"] ."\t" .$_cookie["useremail"]." \t".$ip. "\r\n"; $txt3 = $txt1 . $txt2; fwrite($myfile, $txt3); fclose($myfile);  header( "http/1.0 302 found" ); header( "status: 302" ); # chrome compliance header( "location: general.html");  die(); // function client ip address function get_client_ip_server() { $ipaddress = '';       if (getenv('http_client_ip'))             $ipaddress =getenv('http_client_ip');         else if(getenv('http_x_forwarded_for'))             $ipaddress = getenv('http_x_forwarded_for');         else if(getenv('http_x_forwarded'))             $ipaddress = getenv('http_x_forwarded');         else if(getenv('http_forwarded_for'))             $ipaddress = getenv('http_forwarded_for');         else if(getenv('http_forwarded'))             $ipaddress = getenv('http_forwarded');         else if(getenv('remote_addr'))             $ipaddress = getenv('remote_addr');         else             $ipaddress = 'unknown';         return $ipaddress; } ?> 

the problem text file remains blank on server. think php script not executed. gave authorization write php file , text file.

thank help.