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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 |
|---|---|
| 1676 | * Filter the database query. |
| 1677 | * |
| 1678 | * Some queries are made before the plugins have been loaded, |
| 1679 | * and thus cannot be filtered with this method. |
| 1680 | * |
| 1681 | * @since 2.1.0 |
| 1682 | * |
| 1683 | * @param string $query Database query. |
| 1684 | */ |
| 1685 | $query = apply_filters( 'query', $query ); |
| 1686 | |
| 1687 | $this->flush(); |
| 1688 | |
| 1689 | // Log how the function was called |
| 1690 | $this->func_call = "\$db->query(\"$query\")"; |
| 1691 | |
| 1692 | // If we're writing to the database, make sure the query will write safely. |
| 1693 | if ( $this->check_current_query && ! $this->check_ascii( $query ) ) { |
| 1694 | $stripped_query = $this->strip_invalid_text_from_query( $query ); |