Cannot convert new database connection to older one - mysql

Question

I need to convert this new database connectivity and retrive information from database to older fashion for my project. I have done the connection according to older fashion way PHP 4.0 but i need to use this PDO connectivity code to older database connectivity as i am not familiar with how to use and retrive information with using the older database connectivity.
Thank you.
<?php
$pdo = new PDO('mysql:host=localhost;dbname=sitepoint', 'root', '*****');
$opts = $_POST['filterOpts'];
$qMarks = str_repeat('?,', count($opts) - 1) . '?';
$statement = $pdo->prepare("SELECT mobile_phone.id, name, model, price FROM mobile_phone INNER JOIN brand ON brand_id = brand.id WHERE name IN ($qMarks)");
$statement -> execute($opts);
$results = $statement -> fetchAll(PDO::FETCH_ASSOC);
$json = json_encode($results);
echo($json);
?>
and i have tried this way with the older database connevtivity but its giving me nothing:
$opts = $_POST['filterOpts'];
$qMarks = str_repeat('?,', count($opts) - 1) . '?';
$statement = "SELECT mobile_phone.id, name, model, price FROM mobile_phone INNER JOIN brand ON brand_id = brand.id WHERE name IN ($qMarks)";
$statement1 = mysql_query($statement);
$results = mysql_fetch_assoc($statement1);
$json = json_encode($results);
echo($json);

Answer 1

mysql_query (and related) doesn't support bindings, so the final query is as follows
SELECT mobile_phone.id, name, model, price FROM mobile_phone INNER JOIN brand ON brand_id = brand.id WHERE name IN (?,?,?,?)
To be able of use dynamic parameters the same way with PDO, you should wrap each of them manually.
An approach could be as follows,
$opts = array();
foreach ($_POST['filterOpts'] as $filter) {
$opts[] = '\'' . mysql_real_escape_string($filter) . '\'';
}
$qMarks = implode(',', $opts);
$statement = "SELECT mobile_phone.id, name, model, price FROM mobile_phone INNER JOIN brand ON brand_id = brand.id WHERE name IN ($qMarks)";
$statement1 = mysql_query($statement);
$results = mysql_fetch_assoc($statement1);
$json = json_encode($results);
echo($json);