Cron job script not working - php

Question

So basically I have this cronjob script which worked on godaddy php 5.4, but in different host it does not work, tried different php versions too. I have correct path to cron, the host support said I did, even presented me with logs. Maybe there is some problem with this script? It basically adds energy points to user account.
<?php
include "../core.php";
//Fuel Refill (by default every 10 minutes)
$sqlusers = mysql_query("SELECT * FROM users WHERE banned='No'");
while ($rowuser = mysql_fetch_assoc($sqlusers)) {
if ($rowuser['fuel'] < $rowuser['fuelcapacity']) {
$userfuelrefill = mysql_query("UPDATE users SET fuel=fuel+1 WHERE username='$rowuser[username]'");
}
}
echo '<meta http-equiv="refresh" content="0;url=../garage">';
?>

Answer 1

mysql extensions are deprecated so try this PDO approach:
<?php
require [full/script/path/]core.php;
$PDO = new PDO([INSERT CONNECTION STRING]);
$result = $PDO->query("SELECT * FROM users WHERE banned='No'")->fetchAll(PDO::FETCH_ASSOC);
foreach ($result as $row)
{
if ($row['fuel'] < $row['fuelcapacity']) {
$query = "UPDATE users SET fuel=fuel+1 WHERE username= :username";
$query = $PDO->prepare($query);
if ($query->execute(array(':username' => $row[username]))) {
} else { throw new Exception('SQL Query Failed [' . $query->errorCode . ']'); }
}
}
echo '<meta http-equiv="refresh" content="0;url=../garage">';
Now of course there are some things you will have to replace like the connection string and full path but this should work with PHP PDO enabled.