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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 |
|---|---|
| 1020 | */ |
| 1021 | function wp_admin_viewport_meta() { |
| 1022 | /** |
| 1023 | * Filters the viewport meta in the admin. |
| 1024 | * |
| 1025 | * @since 5.5.0 |
| 1026 | * |
| 1027 | * @param string $viewport_meta The viewport meta. |
| 1028 | */ |
| 1029 | $viewport_meta = apply_filters( 'admin_viewport_meta', 'width=device-width,initial-scale=1.0' ); |
| 1030 | |
| 1031 | if ( empty( $viewport_meta ) ) { |
| 1032 | return; |
| 1033 | } |
| 1034 | |
| 1035 | echo '<meta name="viewport" content="' . esc_attr( $viewport_meta ) . '">'; |
| 1036 | } |
| 1037 | |
| 1038 | /** |