HTML file(With php)

<?php
$error = array();
if(isset($_POST['submit'])){
    if(!isset($_POST['name']) || $_POST['name'] == ''){
        $error[1] = 'Please enter the name form.';
    }
    if(!isset($_POST['lang']) || $_POST['lang'] == array()){
        $error[2] = 'Please enter the language form.';
    }
    if(!isset($_POST['desc']) || $_POST['desc'] == ''){
        $error[3] = 'Please enter the description form.';
    }
    if(!isset($_POST['file']) || $_POST['file'] == ''){
        $error[4] = 'Please select a file.';
    }
    if(isset($error) && $error != array()){
        foreach($error as $e => $k){
            echo '<div class="alert alert-danger" role="alert"><strong>Error!</strong> ' . $k . '</div>';
        }
    }else{
        $data = array();
        $data['name'] = $db->mySQLSafe($_POST['name']);
        $data['file'] = $db->mySQLSafe(serialize($_POST['file']));
        $data['description'] = $db->mySQLSafe($_POST['desc']);
        $data['author'] = $db->mySQLSafe($result[0]['full name']);
        $data['page'] = $db->mySQLSafe('projects');

        $insert = $db->insert('projects', $data);
        if($insert){
            $target_file = 'projects/' . basename($_FILES["file"]["name"]);
            $fileType = pathinfo($target_file,PATHINFO_EXTENSION);
            echo $target_file . '<br />';
            echo $fileType . '<br />';
            $uploadok = 1;
            if (file_exists($target_file)) {
                echo '<div class="alert alert-danger" role="alert"><strong>Error!</strong> That file already exists, try a different file name.</div>';
                $uploadok = 0;
            }
            if ($_FILES["file"]["size"] > 500000) {
                echo '<div class="alert alert-danger" role="alert"><strong>Error!</strong> That file is too large.</div>';
                $uploadok = 0;
            }
            if($fileType != 'zip' && $fileType != 'gz' && $fileType != 'java' && $fileType != 'py' && $fileType != 'html' && $fileType != 'css' && $fileType != 'js'){
                echo '<div class="alert alert-danger" role="alert"><strong>Error!</strong> That type of file is not acceptable.</div>';
                $uploadok = 0;
            }
            if($uploadok == 0){
                echo '<div class="alert alert-danger" role="alert"><strong>Error!</strong> The file was not uploaded.</div>';
            }else{
                if(move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)){
                    echo '<div class="alert alert-success" role="alert"><strong>Yes!</strong> It was successfully submitted!</div>';
                }else{
                    echo '<div class="alert alert-warning" role="alert"><strong>Warning!</strong> There was an error uploading your file with error code ' . $_FILES['file']['error'] . '.</div>';
                }
            }
        }else{
            echo '<div class="alert alert-danger" role="alert"><strong>Error!</strong> There was an error inserting the data.</div>';
        }
    }
}
?>

<form class="form-horizontal" method="POST" enctype="multipart/form-data">
    <!--
    <div class="form-group">
        <label for="id" class="col-sm-2 control-label">Text</label>
        <div class="col-sm-10">
            <input type="text" class="form-control" name="name" id="id" placeholder="placeholder">
        </div>
    </div>
    -->
    <div class="form-group">
        <label for="name" class="col-sm-2 control-label">Name of the Program</label>
        <div class="col-sm-10">
            <input type="text" class="form-control" name="name" id="name" placeholder="Name">
        </div>
    </div>
    <div class="form-group">
        <label for="lang" class="col-sm-2 control-label">What language is it in</label>
        <div class="col-sm-10">
            <select multiple class="form-control" id="lang" name="lang[]">
                <option value="java">Java</option>
                <option value="python">Python</option>
                <option value="webiste">Website(HTML, PHP, CSS or Javascript)</option>
            </select>
        </div>
        <span id="helpBlock" class="help-block">Hold down control to select multiple.</span>
    </div>
    <div class="form-group">
        <label for="desc" class="col-sm-2 control-label">Give a description about it</label>
        <div class="col-sm-10">
            <textarea id="desc" name="desc" class="form-control" rows="4" placeholder="Description"></textarea>
        </div>
    </div>
    <div class="form-group">
        <label for="file" class="col-sm-2 control-label">Upload the file</label>
        <div class="col-sm-10">
            <input type="hidden" name="MAX_FILE_SIZE" value="500000" />
            <input type="file" class="form-control file" name="file" id="file" placeholder="File">
        </div>
        <span id="helpBlock" class="help-block">If it is in multiple files put it in a ZIP file.</span>
    </div>
    <div class="form-group">
        <div class="col-sm-offset-2 col-sm-10">
            <button type="submit" name="submit" class="btn btn-default">Continue</button>
        </div>
    </div>
</form>