PHP and MySQLi query always returning 0 - php

Question

The following code seems to be not working correctly. I'm new to PHP and jQuery.
php:
<?php
//if (!defined('BOOTSTRAP')) { die('Access denied'); }
//if we got something through $_POST
if (isset($_POST['postcode_locator_search'])) {
// here you would normally include some database connection
//include('config.local.php');
//Open a new connection to the MySQL server
$mysqli = new mysqli('localhost','test','c#W)ukmd[0bm','test');
//Output any connection error
if ($mysqli->connect_error) {
die('Error : ('. $mysqli->connect_errno .') '. $mysqli->connect_error);
}
// never trust what user wrote! We must ALWAYS sanitize user input
$postcode_q = mysqli_real_escape_string($mysqli, $_POST['postcode_locator_search']);
$postcode_q = htmlentities($postcode_q);
// A select query. $result will be a `mysqli_result` object if successful
$result = mysqli_query("SELECT description FROM cscart_postcode_location_descriptions WHERE cscart_postcode_location_descriptions LIKE '%" . $postcode_q . "%' ORDER BY cscart_postcode_location_descriptions LIMIT 1");
if($result === false) {
// Handle failure - log the error, notify administrator, etc.
echo '1';
} else {
// Fetch all the rows in an array
echo '0';
}
$mysqli->close();
}
?>
JS / HTML:
{assign var="prod_id" value=$product.product_id}
<form action="search_postcode.php" method="post" class="postcode_locator_form" name="postcode_locator_form">
<div class="ty-control-group">
<label for="postcode_locator_search{$block.block_id}" class="ty-control-group__title">{__("postcode_search")}</label>
<p class="filling-notice">{__("postcode_search_desc")}</p>
<div class="ty-input-append ty-m-none">
<input type="text" size="20" class="ty-input-text" id="postcode_locator_search" name="postcode_locator_search" value="{$postcode_locator_search.q}" />
{include file="buttons/go.tpl" but_name="postcode_locator.search" alt=__("search")}
</div>
</div>
</form>
<div class="filling-status filling-success">
<h3>Add filling to your bean bag</h3>
<p>Searched postcode: <span class="searched-postcode"></span></p>
<p class="beans-msg">{__("add_some_beans_success")} {__("click_here")}</p>
</div>
<div class="filling-status filling-failure">
<h3>Add filling to your bean bag</h3>
<p>Searched postcode: <span class="searched-postcode"></span></p>
<p class="beans-msg">{__("add_some_beans_error")}</p>
</div>
<script>
$(function() {
$(".filling-status").hide();
$(".postcode_locator_form .ty-btn-go").click(function() {
// getting the value that user typed
var searchString = $("#postcode_locator_search").val();
// forming the queryString
var data = 'postcode_locator_search='+ searchString;
// if searchString is not empty
if(searchString) {
// ajax call
$.ajax({
type: "POST",
url: "search_postcode.php",
data: data,
beforeSend: function(html) { // this happens before actual call
$(".searched-postcode").html(searchString);
},
success: function(data){ // this happens after we get results
console.log(data);
if(data == '0'){
$(".filling-status.filling-success").show();
} else if(data == '1'){
$(".filling-status.filling-failure").show();
}
}
});
}
return false;
});
});
</script>
The communication is all working, but it always returns 0 as a success from whatever I search for and seems to not check database for the result.
What I need is if I search something and it's a match, to return 0 as a success but if not found / a match to return 1 as a failure.

Answer 1

If you want to retrieve your data:
$result = mysqli_query("SELECT description FROMcscart_postcode_location_descriptions WHERE cscart_postcode_location_descriptions LIKE '%" . $postcode_q . "%' ORDER BY cscart_postcode_location_descriptions LIMIT 1");
if($result === false) {
// Handle failure - log the error, notify administrator, etc.
echo '1';
} else {
// Fetch all the rows in an array
while($row = mysqli_fetch_assoc($result)){
echo $row['id']; //prints the resulted id
}
}

Answer 2

Use mysqli_num_rows to detect if you have a result
if($result === false or mysqli_num_rows($result) === 0) {
echo '1';
}
I would recommend breaking this into two if conditions though so that you handle errors separately from a query with no result