Custom tag %image_alt_text% for Image Attributes Pro.

iap-custom-tag-image-alt-text

/**
 * Custom tag %image_alt_text% for Image Attributes Pro.
 * 
 * @param $image_id The ID of the image that is being updated. 
 * @param $parent_post_id The post to which the image is attached (uploaded) to. 
 * @param $args (array) An array containing additional arguments.
 * 
 * @return (string) Image alt text from Media Library.
 */
function iaffpro_get_custom_attribute_tag_image_alt_text( $image_id, $parent_post_id, $args = array() ) {

	// Retrieve image alt text
	$alt_text = get_post_meta( $image_id, '_wp_attachment_image_alt', true );

	// Return image alt text if it exist. Empty string otherwise.
	return $alt_text ? $alt_text : '';
}