Sindbad~EG File Manager

<?php

namespace RealPress\Helpers;

class Media {
	/**
	 * @param $attachment_id
	 *
	 * @return string
	 */
	public static function get_image_alt( $attachment_id ) {
		if ( ! $attachment_id ) {
			return '';
		}

		$attachment = get_post( $attachment_id );
		if ( ! $attachment ) {
			return '';
		}

		$alt = get_post_meta( $attachment_id, '_wp_attachment_image_alt', true );
		if ( ! $alt ) {
			$alt = $attachment->post_excerpt;
			if ( ! $alt ) {
				$alt = $attachment->post_title;
			}
		}
		return trim( strip_tags( $alt ) );
	}
}