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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 |
|---|---|
| 2404 | wp_nonce_field( $nonce_action ); |
| 2405 | |
| 2406 | /* |
| 2407 | * Some meta boxes hook into these actions to add hidden input fields in the classic post form. |
| 2408 | * For backward compatibility, we can capture the output from these actions, |
| 2409 | * and extract the hidden input fields. |
| 2410 | */ |
| 2411 | ob_start(); |
| 2412 | /** This filter is documented in wp-admin/edit-form-advanced.php */ |
| 2413 | do_action( 'edit_form_after_title', $post ); |
| 2414 | /** This filter is documented in wp-admin/edit-form-advanced.php */ |
| 2415 | do_action( 'edit_form_advanced', $post ); |
| 2416 | $classic_output = ob_get_clean(); |
| 2417 | |
| 2418 | $classic_elements = wp_html_split( $classic_output ); |
| 2419 | $hidden_inputs = ''; |
| 2420 | foreach ( $classic_elements as $element ) { |
| 2421 | if ( 0 !== strpos( $element, '<input ' ) ) { |
| 2422 | continue; |