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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 |
|---|---|
| 1286 | * Filters whether a meta key is considered protected. |
| 1287 | * |
| 1288 | * @since 3.2.0 |
| 1289 | * |
| 1290 | * @param bool $protected Whether the key is considered protected. |
| 1291 | * @param string $meta_key Metadata key. |
| 1292 | * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', |
| 1293 | * or any other object type with an associated meta table. |
| 1294 | */ |
| 1295 | return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type ); |
| 1296 | } |
| 1297 | |
| 1298 | /** |
| 1299 | * Sanitizes meta value. |
| 1300 | * |
| 1301 | * @since 3.1.3 |
| 1302 | * @since 4.9.8 The `$object_subtype` parameter was added. |
| 1303 | * |
| 1304 | * @param string $meta_key Metadata key. |