[PHP] Hjälp med bilduppladdninssida

$allowed = array('jpg', 'jpeg', 'gif', 'png');

if(isset($_POST['REQUEST_METHOD'] == 'url'))  {
$ext = array_pop(explode('.',$post['url']));
$filename = basename($_POST['url']);
if(in_array($ext, $allowed) {
file_put_contents('img/' . $newname . '.' . $ext ,file_get_contents($_POST['url']))
} else {
print 'non valid ext';
}
}

if($_SERVER['REQUEST_METHOD'] == 'POST') {

    preg_match('/\.([a-zA-Z]+?)$/', $_FILES['file']['name'], $matches);

    if(in_array(strtolower($matches[1]), $accepted)) {

        if($_FILES['file']['size'] <= $maxsize) {

            $newname = md5_file($_FILES['file']['tmp_name']).'.'.$matches[1];

            move_uploaded_file($_FILES['file']['tmp_name'], $filedir.'/'.$newname);

            $linkurl = 'http://'.$_SERVER['HTTP_HOST'].preg_replace('/\/([^\/]+?)$/', '/', $_SERVER['PHP_SELF']).'#'.$newname;

            $imgurl = 'http://'.$_SERVER['HTTP_HOST'].preg_replace('/\/([^\/]+?)$/', '/', $_SERVER['PHP_SELF']).$filedir.'/'.$newname;
			$alt = $_POST["alt"];

            print '<h2>Bilden laddades upp utan problem!!!!</h2> <p id="codes">
         
          <img src="'.$imgurl.'" height="430" widht="291" alt="Bilden är uppladdad" >

            <label for="codedirect">Direkt Länk:</label>
            <input type="text" id="codedirect" value="'.$imgurl.'" onclick="javascript:this.focus();this.select();" size="40" readonly="true" /></p>';

        } else 

            print '<h2>Sorry, Max storleken är 1Mb<h2>';

    } else

        print '<h2>Sorry, Filtypen är inte tillåten.<h2>';

}

<FORM enctype="x-www-form-urlencoded" ACTION="<?php print preg_replace('/\/([^\/]+?)$/', '/', $_SERVER['PHP_SELF']) ?>" method="url">

<label for="file">Laddar upp bilden genom URL: </label><input type="text" name="file" id="url" />

<br><br><br>

<input name="submit" type="submit" value="Ladda upp...." class="button"> 

</form>

include('config.php');

// check against a regexp for an actual http url and for a valid filename, also extract that filename using a submatch (see PHP's regexp docs to understand this)
if(preg_match('/\.([a-zA-Z]+?)$/('.$accepted.'))$#', $_FILES['file']['name'], $matches)) {
  die('Invalid url given');
}

// try getting the image
if($img = file_get_contents($_POST['img_url'])) {
  die('Getting that file failed');
}

// try writing the file with the original filename -- note that this will overwrite any existing filename in the same directory -- that's up to you to check for 
if(file_put_contents($filedir.$matches[1], $img)) { 
  die('Writing the file failed');  
}