Error in from fopen() in my brand new set_featured_image() func

EDIT: If anyone find this function useful – feel free to use it. I was originally created it with a friend in order to get a file from Gravity Forms file upload field and use it as a featured image for a given post.

I have this cutie:

// Insert picture to Media Library

function set_featured_image( $post_id, $file_path_old, $end_folder = '', $filename = '' ) {

	// $file_path_old is actually URL so first convert it to path

	$file_path_old = str_replace( WP_CONTENT_URL, WP_CONTENT_DIR, $file_path_old );

	// Check the type of file

	$file_type_and_ext = wp_check_filetype( basename( $file_path_old ), null );

	// If no filename was supplied, rename the file according post title

	if ( empty( $filename ) )
	{
		$filename = basename( get_permalink( $post_id ) ) . '.' . $file_type_and_ext['ext'];
	}
	else
	{
		$filename .= $file_type_and_ext['ext'];
	}

	// Prepare category subfolder

	$categories = get_the_category( $post_id );

	// Prepare the new path and filename

	if ( !empty ( $end_folder ) )
	{
		$file_path_new = WP_CONTENT_DIR . '/uploads/' . $categories[0]->slug . '/' . $end_folder . '/' . $filename;
	}
	else
	{
		$file_path_new = WP_CONTENT_DIR . '/uploads/' . $categories[0]->slug . '/' . $filename;
	}

	// Move the file from the old path to the new one and rename it

	rename( $file_path_old, $file_path_new );

	// Prepare an array of post data for the attachment

	$file_url = str_replace( WP_CONTENT_DIR, WP_CONTENT_URL, $file_path_new );

	$attachment = array(
		'guid'				=> $file_url,
		'post_mime_type'	=> $file_type_and_ext['type'],
		'post_title'		=> preg_replace( '/\.[^.]+$/', '', $filename ),
		'post_content'		=> '',
		'post_status'		=> 'inherit'
	);

	// Insert the attachment

	$attachment_id = wp_insert_attachment( $attachment, $file_path_new, $post_id );

	// Make sure that this file is included, as wp_generate_attachment_metadata() depends on it

	require_once( ABSPATH . 'wp-admin/includes/image.php' );

	// Generate the metadata for the attachment, and update the database record

	$attach_data = wp_generate_attachment_metadata( $attachment_id, $file_url );

	wp_update_attachment_metadata( $attachment_id, $attach_data );

	set_post_thumbnail( $post_id, $attachment_id);
}

And I think I get the errors because of permission issues, as I don’t use the default wp_upload_dir(). Here are the errors:

[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-150x150.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396
[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-300x300.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396
[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-400x272.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396
[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-320x202.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396
[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-52x50.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396
[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-180x138.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396
[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-400x272.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396
[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-400x295.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396
[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-300x214.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396
[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-220x161.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396
[27-May-2014 13:42:52 UTC] PHP Warning:  fopen(https://test.servix.co.il/wp-content/test-folder/sample-66x66.jpg): failed to open stream: HTTP wrapper does not support writeable connections in /home/servixcare/public_html/test/wp-includes/class-wp-image-editor.php on line 396

So if anyone can help me debug this it would be sooo awesome, and also if you have any other recommendations about the code – please tell me ??

Thanks!!