Plugin API/Filter Reference/title edit pre

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Description

The "title_edit_pre" filter is part of a group of dynamic filters. This filter runs in wp-admin when loading a post for editing. The content that shows in the title text box will be passed as a parameters along with the id of the post.

Usage

When the 'title_edit_pre' filter is called, it is passed two parameters: the title and the id of the post to be edited

function filter_function_name( $title, $post_id ) {
  // Process content here
  return $title;
}
add_filter( 'title_edit_pre', 'filter_function_name', 10, 2 );

Where 'filter_function_name' is the function WordPress should call when filter is run. Note that the filter function must return a string after it is finished processing or the title will be empty.

filter_function_name should be unique function name. It cannot match any other function name already declared.

Codex