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PHP MySQL insert issue

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Here is the code for both the connection file and the main body of script. I assure you the passwords and actual names do match as I have done other tests before hand. 



	$title = "Register";
	include 'includes/header.php';  

    if($_SERVER['REQUEST_METHOD'] == 'POST') {
    	require 'includes/connection.php';

    		//create FALSE figures
    		$username = $password = FALSE;

    		//trim all data
    		$trimmed = array_map('trim', $_POST);

    		$errors = array();

    	//check username
	    if(preg_match ('/[A-Za-z0-9]{2,20}/', $trimmed['username'])) {
	    	$username = mysqli_real_escape_string($dbc, $trimmed['username']);
	    } else {
	    	$errors[] = 'Enter a username';

	    //check password
	    if(preg_match ('/[A-Za-z0-9]{4,20}/', $trimmed['password'])) {
	    	$username = mysqli_real_escape_string($dbc, $trimmed['password']);
	    } else {
	    	$errors[] = 'Enter a password';

	    //variables not == FALSE
	    if($username && $password) {

		    $q = "SELECT user_id FROM users WHERE username='$username'";
		    $r = mysqli_query ($dbc, $q) OR trigger_error("Query: $q\n<br />MYSQL Error: ". mysql_error($dbc));

		    if(mysqli_num_rows($r) == 0) {
		    	$q = "INSERT INTO users (username, password, registration_date) VALUES ('$username', SHA1('$password'), NOW() )";
		    	$r = mysqli_query ($dbc, $q) OR trigger_error("Query: $q\n<br />MYSQL Error: ". mysql_error($dbc));
    		if(mysqli_affected_rows($dbc) == 1) {
    			echo "success";
    			//header('Location: database.php');

		} else {
			foreach ($errors as $msg) {
		    	echo " - $msg<br />\n";


    <form action="register.php" method="POST">
        <input type="text" name="username" value="<?php if(isset($trimmed['username'])) echo $trimmed['username']; ?>" placeholder="Username"/>
        <input type="password" name="password" value="<?php if(isset($trimmed['username'])) echo $trimmed['password']; ?>" placeholder="Password"/>
        <input type="submit" class="button1" name="Sign Up" />


    $dbhost = 'localhost';
    $dbuser = 'root';
    $dbpass = 'password';
    $db = 'ze';

    $dbc = mysqli_connect($dbhost, $dbuser, $dbpass) OR die ('Could not connect. MYSQL:' .mysql_error() );


Whenever I run this it does not seem to want to work, and also outputs no errors. I probably cant see something and need a second opinion. 

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