jquery validate remote method usage to check if username already exists

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Bloom
06 May 2016
1//HTML
2$("#signupForm").validate({
3  rules: {
4    username: {
5      required: true,
6      minlength: 3,
7      remote: "check-username.php"
8    }
9  },
10  messages: {
11    username:{
12      remote: "This username is already taken! Try another."
13    }
14  }
15});
16
17//PHP code of check-username.php
18<?php
19
20header('Content-type: application/json');
21$request = $_REQUEST['username'];
22
23$query = mysql_query("SELECT * FROM mmh_user_info WHERE username ='$username'");
24$result = mysql_num_rows($query);
25if ($result == 0){
26$valid = 'true';}
27else{
28$valid = 'false';
29}
30echo $valid;
31exit;
32?>
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