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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 |
|---|---|
| 1133 | * Filters the registration arguments when registering meta. |
| 1134 | * |
| 1135 | * @since 4.6.0 |
| 1136 | * |
| 1137 | * @param array $args Array of meta registration arguments. |
| 1138 | * @param array $defaults Array of default arguments. |
| 1139 | * @param string $object_type Object type. |
| 1140 | * @param string $meta_key Meta key. |
| 1141 | */ |
| 1142 | $args = apply_filters( 'register_meta_args', $args, $defaults, $object_type, $meta_key ); |
| 1143 | $args = wp_parse_args( $args, $defaults ); |
| 1144 | |
| 1145 | $object_subtype = ! empty( $args['object_subtype'] ) ? $args['object_subtype'] : ''; |
| 1146 | |
| 1147 | // If `auth_callback` is not provided, fall back to `is_protected_meta()`. |
| 1148 | if ( empty( $args['auth_callback'] ) ) { |
| 1149 | if ( is_protected_meta( $meta_key, $object_type ) ) { |
| 1150 | $args['auth_callback'] = '__return_false'; |
| 1151 | } else { |