File upload profile avatar - php

Question

I'm trying to create a social network site and I've been watching tutorials where the users can upload their profile picture and change their avatar. However, whenever I try to upload a picture it gives me an error 'File upload failed' I'm not very sure how to fix it or what exactly to do. Where exactly do I need to dump all the pictures the users have uploaded?
photo_system.php
<?php
if (isset($_FILES["avatar"]["name"]) && $_FILES["avatar"]["tmp_name"] != ""){
$fileName = $_FILES["avatar"]["name"];
$fileTmpLoc = $_FILES["avatar"]["tmp_name"];
$fileType = $_FILES["avatar"]["type"];
$fileSize = $_FILES["avatar"]["size"];
$fileErrorMsg = $_FILES["avatar"]["error"];
$kaboom = explode(".", $fileName);
$fileExt = end($kaboom);
list($width, $height) = getimagesize($fileTmpLoc);
$sql = "SELECT avatar FROM users WHERE username='$log_username' LIMIT 1";
$query = mysqli_query($db_conx, $sql);
$row = mysqli_fetch_row($query);
$avatar = $row[0];
if($avatar != ""){
$picurl = "../user/$log_username/$avatar";
if (file_exists($picurl)) { unlink($picurl); }
}
$moveResult = move_uploaded_file($fileTmpLoc, "../user/$log_username/$db_file_name");
if ($moveResult != true) {
header("location: ../message.php?msg=ERROR: File upload failed");
exit();
}
user.php
$profile_pic = "";
$profile_pic_btn = "";
$avatar_form = "";
// Check to see if the viewer is the account owner
$isOwner = "no";
if($u == $log_username && $user_ok == true){
$isOwner = "yes";
$profile_pic_btn = 'Toggle Avatar Form';
$avatar_form = '<form id="avatar_form" enctype="multipart/form-data" method="post" action="php_parsers/photo_system.php">';
$avatar_form .= '<h4>Change your avatar</h4>';
$avatar_form .= '<input type="file" name="avatar" required>';
$avatar_form .= '<p><input type="submit" value="Upload"></p>';
$avatar_form .= '</form>';
}

Answer 1

Create directory first if not exist
if($avatar != ""){
$picurl = "../user/$log_username/$avatar";
if (file_exists($picurl)) { unlink($picurl); }
if(!file_exists($picurl)){
mkdir($picurl, 0777,true);
}
}