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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 |
|---|---|
| 1556 | /** |
| 1557 | * Filter whether a meta key is protected. |
| 1558 | * |
| 1559 | * @since 3.2.0 |
| 1560 | * |
| 1561 | * @param bool $protected Whether the key is protected. Default false. |
| 1562 | * @param string $meta_key Meta key. |
| 1563 | * @param string $meta_type Meta type. |
| 1564 | */ |
| 1565 | return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type ); |
| 1566 | } |
| 1567 | |
| 1568 | /** |
| 1569 | * Sanitize meta value. |
| 1570 | * |
| 1571 | * @since 3.1.3 |
| 1572 | * |
| 1573 | * @param string $meta_key Meta key |
| 1574 | * @param mixed $meta_value Meta value to sanitize |