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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 |
|---|---|
| 1094 | */ |
| 1095 | function wp_admin_viewport_meta() { |
| 1096 | /** |
| 1097 | * Filters the viewport meta in the admin. |
| 1098 | * |
| 1099 | * @since 5.5.0 |
| 1100 | * |
| 1101 | * @param string $viewport_meta The viewport meta. |
| 1102 | */ |
| 1103 | $viewport_meta = apply_filters( 'admin_viewport_meta', 'width=device-width,initial-scale=1.0' ); |
| 1104 | |
| 1105 | if ( empty( $viewport_meta ) ) { |
| 1106 | return; |
| 1107 | } |
| 1108 | |
| 1109 | echo '<meta name="viewport" content="' . esc_attr( $viewport_meta ) . '">'; |
| 1110 | } |
| 1111 | |
| 1112 | /** |