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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 |
---|---|
253 | * returning that value otherwise. |
254 | * |
255 | * @since 3.9.0 |
256 | * |
257 | * @see wp_nav_menu() |
258 | * |
259 | * @param string|null $output Nav menu output to short-circuit with. Default null. |
260 | * @param object $args An object containing wp_nav_menu() arguments. |
261 | */ |
262 | $nav_menu = apply_filters( 'pre_wp_nav_menu', null, $args ); |
263 |
|
264 | if ( null !== $nav_menu ) { |
265 | if ( $args->echo ) { |
266 | echo $nav_menu; |
267 | return; |
268 | } |
269 |
|
270 | return $nav_menu; |
271 | } |