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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 |
|---|---|
| 104 | * echoing that value if $args->echo is true, returning that value otherwise. |
| 105 | * |
| 106 | * @since 3.9.0 |
| 107 | * |
| 108 | * @see wp_nav_menu() |
| 109 | * |
| 110 | * @param string|null $output Nav menu output to short-circuit with. Default null. |
| 111 | * @param stdClass $args An object containing wp_nav_menu() arguments. |
| 112 | */ |
| 113 | $nav_menu = apply_filters( 'pre_wp_nav_menu', null, $args ); |
| 114 | |
| 115 | if ( null !== $nav_menu ) { |
| 116 | if ( $args->echo ) { |
| 117 | echo $nav_menu; |
| 118 | return; |
| 119 | } |
| 120 | |
| 121 | return $nav_menu; |
| 122 | } |