Alters the checkout billing fields
Paramsarray $field_list The list of checkout billing fields.Returnarray
Set checkout CSS classes
Paramsstring $value The value to set.Returnstring
Check the post content
Paramsstring $post_content The Post content.WP_Post $post The Post object.Returnarray
Check the post content
Paramsstring $post_content The Post content.WP_Post $post The Post object.Returnarray
Check if one shortcode has already been added to the page
Paramsboolean $value The value to check.Returnboolean