Question

I’m trying to make some sort of communication between two servers(can be called license verification).

Already got this:

index.php

if ($verification == 1) {
    echo "license validated";
}
else {
    echo "this license key does not exist.";
}

validate.php

$license_key = mysql_real_escape_string($_GET['license_key']);

$query = "SELECT license_key FROM users WHERE license_key = '$license_key'";
$mysqli = new mysqli();
$mysqli->connect($db_hostname, $db_username, $db_password, $db_name);
if ($mysqli->connect_errno) {
    echo "Failed to connect to MySQL: " . $mysqli->connect_error;
}
$result = $mysqli->query($query);
$row_cnt = $result->num_rows;
if ($row_cnt == 1) {
    return true;
}
else {
    return false;
}

What I can’t figure out is how to send that request from index.php to validate.php ( this 2 files are not in same server ) and how to get back to index.php information what it returns (true or false).

Answer 1

Use file_get_contents:

$verify_result = file_get_contents("http://validation.domain.com/validate.php?license_key=$key");
if ($verify_result == 'license validated') {
  ...
}