Source View: pre_{$field}

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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: apply_filters( "hook_name", "what_to_filter" ).

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

Source View

Line Code
383           $value = apply_filters( "edit_$field", $value, $bookmark_id );
384
385           if ( 'link_notes' == $field ) {
386                $value = esc_html( $value ); // textarea_escaped
387           } else {
388                $value = esc_attr($value);
389           }
390      } else if ( 'db' == $context ) {
391           /** This filter is documented in wp-includes/post.php */
392           $value = apply_filters( "pre_$field", $value );
393      } else {
394           /** This filter is documented in wp-includes/post.php */
395           $value = apply_filters( $field, $value, $bookmark_id, $context );
396
397           if ( 'attribute' == $context )
398                $value = esc_attr($value);
399           else if ( 'js' == $context )
400                $value = esc_js($value);
401      }