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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 |
|---|---|
| 17 | * "special". |
| 18 | * |
| 19 | * @uses locate_template() |
| 20 | * @since 1.5.0 |
| 21 | * @uses do_action() Calls 'get_header' action. |
| 22 | * |
| 23 | * @param string $name The name of the specialised header. |
| 24 | */ |
| 25 | function get_header( $name = null ) { |
| 26 | do_action( 'get_header' ); |
| 27 | |
| 28 | $templates = array(); |
| 29 | if ( isset($name) ) |
| 30 | $templates[] = "header-{$name}.php"; |
| 31 | |
| 32 | $templates[] = "header.php"; |
| 33 | |
| 34 | if ('' == locate_template($templates, true)) |
| 35 | load_template( get_theme_root() . '/default/header.php'); |