upload.php

<?php
include 'header.php';
$target_dir = "uploads/";
$target_file = $target_dir.basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));

// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        echo "Bestand is een foto - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "Dit bestand is geen foto.";
        $uploadOk = 0;
    }
}

// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, deze foto bestaat al.";
    $uploadOk = 0;
}

// Check file size
if ($_FILES["fileToUpload"]["size"] > 1000000) {
    echo "Sorry, uw foto is te groot.";
    $uploadOk = 0;
}

// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
    && $imageFileType != "gif" ) {
    echo "Sorry, alleen JPG, JPEG, PNG & GIF bestanden worden ondersteund.";
    $uploadOk = 0;
}

// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, er is iets mis gegaan, probeer het opnieuw.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "Uw bestand: ". htmlspecialchars( basename( $_FILES["fileToUpload"]["name"])). " is geupload!.";
    } else {
        echo "Sorry, er heeft zich een probleem voorgedaan tijdens het uploaden.";
    }
}
?>