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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 |
|---|---|
| 204 | function get_search_form( $echo = true ) { |
| 205 | /** |
| 206 | * Fires before the search form is retrieved, at the start of get_search_form(). |
| 207 | * |
| 208 | * @since 2.7.0 as 'get_search_form' action. |
| 209 | * @since 3.6.0 |
| 210 | * |
| 211 | * @link https://core.trac.wordpress.org/ticket/19321 |
| 212 | */ |
| 213 | do_action( 'pre_get_search_form' ); |
| 214 | |
| 215 | $format = current_theme_supports( 'html5', 'search-form' ) ? 'html5' : 'xhtml'; |
| 216 | |
| 217 | /** |
| 218 | * Filter the HTML format of the search form. |
| 219 | * |
| 220 | * @since 3.6.0 |
| 221 | * |
| 222 | * @param string $format The type of markup to use in the search form. |