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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 |
|---|---|
| 180 | function get_search_form( $echo = true ) { |
| 181 | /** |
| 182 | * Fires before the search form is retrieved, at the start of get_search_form(). |
| 183 | * |
| 184 | * @since 2.7.0 as 'get_search_form' action. |
| 185 | * @since 3.6.0 |
| 186 | * |
| 187 | * @link https://core.trac.wordpress.org/ticket/19321 |
| 188 | */ |
| 189 | do_action( 'pre_get_search_form' ); |
| 190 | |
| 191 | $format = current_theme_supports( 'html5', 'search-form' ) ? 'html5' : 'xhtml'; |
| 192 | |
| 193 | /** |
| 194 | * Filters the HTML format of the search form. |
| 195 | * |
| 196 | * @since 3.6.0 |
| 197 | * |
| 198 | * @param string $format The type of markup to use in the search form. |