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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 |
---|---|
2414 | wp_nonce_field( $nonce_action ); |
2415 |
|
2416 | /* |
2417 | * Some meta boxes hook into these actions to add hidden input fields in the classic post form. |
2418 | * For backward compatibility, we can capture the output from these actions, |
2419 | * and extract the hidden input fields. |
2420 | */ |
2421 | ob_start(); |
2422 | /** This filter is documented in wp-admin/edit-form-advanced.php */ |
2423 | do_action( 'edit_form_after_title', $post ); |
2424 | /** This filter is documented in wp-admin/edit-form-advanced.php */ |
2425 | do_action( 'edit_form_advanced', $post ); |
2426 | $classic_output = ob_get_clean(); |
2427 |
|
2428 | $classic_elements = wp_html_split( $classic_output ); |
2429 | $hidden_inputs = ''; |
2430 | foreach ( $classic_elements as $element ) { |
2431 | if ( 0 !== strpos( $element, '<input ' ) ) { |
2432 | continue; |