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After you get up and running, you can place Font Awesome icons just about anywhere with the tag:

 
 fa-user

It's as simple as that, one thing to think about is if you're uploading files, you will probably want to store a history of who uploaded the file and when in a database. Find below the complete PHP code:

 
// Check for errors
if($_FILES['file_upload']['error'] > 0){
    die('An error ocurred when uploading.');
}

if(!getimagesize($_FILES['file_upload']['tmp_name'])){
    die('Please ensure you are uploading an image.');
}

// Check filetype
if($_FILES['file_upload']['type'] != 'image/png'){
    die('Unsupported filetype uploaded.');
}

// Check filesize
if($_FILES['file_upload']['size'] > 500000){
    die('File uploaded exceeds maximum upload size.');
}

// Check if the file exists
if(file_exists('upload/' . $_FILES['file_upload']['name'])){
    die('File with that name already exists.');
}