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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )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.
| Line | Code |
|---|---|
| 2424 | $user_id = $current_user->ID; |
| 2425 | wp_nonce_field( $nonce_action ); |
| 2426 | |
| 2427 | /* |
| 2428 | * Some meta boxes hook into these actions to add hidden input fields in the classic post form. For backwards |
| 2429 | * compatibility, we can capture the output from these actions, and extract the hidden input fields. |
| 2430 | */ |
| 2431 | ob_start(); |
| 2432 | /** This filter is documented in wp-admin/edit-form-advanced.php */ |
| 2433 | do_action( 'edit_form_after_title', $post ); |
| 2434 | /** This filter is documented in wp-admin/edit-form-advanced.php */ |
| 2435 | do_action( 'edit_form_advanced', $post ); |
| 2436 | $classic_output = ob_get_clean(); |
| 2437 | |
| 2438 | $classic_elements = wp_html_split( $classic_output ); |
| 2439 | $hidden_inputs = ''; |
| 2440 | foreach ( $classic_elements as $element ) { |
| 2441 | if ( 0 !== strpos( $element, '<input ' ) ) { |
| 2442 | continue; |