arunbasillal/IAP: Remove trailing hypens from image filename

## IAP: Remove trailing hypens from image filename
/**
 * Removes trailing hyphen from filename if any.
 */
function prefix_iaff_clean_filename_helper( $file ) {

	// Process only images.
	$image_extensions = array (
		'image/jpeg', 'image/gif', 'image/png', 'image/bmp', 'image/tiff', 'ico'
	);

	// Return if file is not an image file
	if ( ! in_array($file['type'],$image_extensions) ) {
		return $file;
	}

	$image_extension = pathinfo( $file['name'] );

	// Trim trailing hyphens in the image filename.
	$image_extension['filename'] = trim( $image_extension['filename'], '-' );

	$file['name'] = $image_extension['filename'] . '.' . $image_extension['extension'];

	return $file;
}
add_filter( 'wp_handle_upload_prefilter', 'prefix_iaff_clean_filename_helper', 20 );