how to save multiple custom fields for a post in one go?

1 comment

1. Custom post meta data are generally updated in the database via a callback function hooked into save_post. (Others: draft_post, publish_post, future_post.)

   The custom post meta data are part of the $_POST data sent on-submit for the edit post screen, so simply look for them there, sanitize them, and then update them in the database.

   I’m omitting things like nonce-checking and sanitizing $_POST data. You’ll want to incorporate them into your callback as necessary.

   For example:

   function wpse63622_save_custom_post_metadata() {
       // Globalize $post
       global $post;
   
       // Find custom post meta data in $_POST
       // DON'T FORGET TO SANITIZE
       $custom_post_meta_1 = ( isset( $_POST['_custom_meta_key_1'] ) ? $_POST['_custom_meta_key_1'] : false );
       $custom_post_meta_2 = ( isset( $_POST['_custom_meta_key_2'] ) ? $_POST['_custom_meta_key_2'] : false );
       $custom_post_meta_3 = ( isset( $_POST['_custom_meta_key_3'] ) ? $_POST['_custom_meta_key_3'] : false );
   
       // Update the database
       if ( $custom_post_meta_1 ) {
           update_post_meta( $post->ID, '_custom_meta_key_1', $custom_post_meta_1 );
       }
       if ( $custom_post_meta_2 ) {
           update_post_meta( $post->ID, '_custom_meta_key_2', $custom_post_meta_2 );
       }
       if ( $custom_post_meta_3 ) {
           update_post_meta( $post->ID, '_custom_meta_key_3', $custom_post_meta_3 );
       }
   }
   add_action( 'save_post', 'wpse63622_save_custom_post_metadata' );
   add_action( 'publish_post', 'wpse63622_save_custom_post_metadata' );
   

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