Example code to be used

    <?php
    //phpinfo();

    error_reporting(E_ALL);
    ini_set('display_errors',1);

    function isFastCGI () {
        return !is_null($_SERVER['FCGI_SERVER_VERSION']);
    }

    var_dump(isFastCGI());

    var_dump(getmyuid(), getmygid());

    var_dump(is_writable('.'));
    var_dump(__DIR__);


    ?>
    <!DOCTYPE html>
    <html>
    <body>

    <form action="" method="post" enctype="multipart/form-data">
        Select image to upload:
        <input type="file" name="fileToUpload" id="fileToUpload">
        <input type="submit" value="Upload Image" name="submit">
    </form>

    <?php


    if(isset($_FILES["fileToUpload"])){

    $target_dir = "uploads/";

    if(!file_exists(__DIR__.'/'.$target_dir)){


    if(!mkdir(__DIR__.'/'.'uploads', 0755, true)) {
            var_dump(error_get_last());
    }

    }
    $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
    $uploadOk = 1;
    $imageFileType = pathinfo($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 "File is an image - " . $check["mime"] . ".";
            $uploadOk = 1;
        } else {
            echo "File is not an image.";
            $uploadOk = 0;
        }
    }
    // Check if file already exists
    if (file_exists($target_file)) {
        echo "Sorry, file already exists.";
        $uploadOk = 0;
    }
    // Check file size
    if ($_FILES["fileToUpload"]["size"] > 500000) {
        echo "Sorry, your file is too large.";
        $uploadOk = 0;
    }
    // Allow certain file formats
    if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg" && $imageFileType != "gif" ) {
        echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
        $uploadOk = 0;
    }
    // Check if $uploadOk is set to 0 by an error
    if ($uploadOk == 0) {
        echo "Sorry, your file was not uploaded.";
    // if everything is ok, try to upload file
    } else {
        if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
            echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
        } else {
            echo "Sorry, there was an error uploading your file.";
            var_dump(error_get_last());
        }
    }

    }
    ?>
    </body>
    </html>