mysqli - PHP -> mySQL Connection Errors -


i'm having connection errors trying connect php mysql. i'm using video instructable, because i've been having several of these connections before, outdated , i'm trying use mysqli instead of mysql commands, i'm winding nothing posting on pages, think because of this. can tell me if correct translation of it?

function user_exists($username) {      $username = sanitize($username);      $query = mysqli_query("select count('user_id') 'users' 'username' = '$username'");

sanitize defined on page (and included) as:

<?php     function sanitize ($data) {         return mysqli_real_escape_string($data);     } ?>

please help!

first need connect mysql..is function have ? incomplete..on screen..

example..

$link = mysqli_connect("localhost","root","","database") or die("error " . mysqli_error($link)); $query = "select `release_year` film limit 5" or die("error in consult.." . mysqli_error($link));  //execute query.  $result = $link->query($query);

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