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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 |
|---|---|
| 1732 | * Filters the database query. |
| 1733 | * |
| 1734 | * Some queries are made before the plugins have been loaded, |
| 1735 | * and thus cannot be filtered with this method. |
| 1736 | * |
| 1737 | * @since 2.1.0 |
| 1738 | * |
| 1739 | * @param string $query Database query. |
| 1740 | */ |
| 1741 | $query = apply_filters( 'query', $query ); |
| 1742 | |
| 1743 | $this->flush(); |
| 1744 | |
| 1745 | // Log how the function was called |
| 1746 | $this->func_call = "\$db->query(\"$query\")"; |
| 1747 | |
| 1748 | // If we're writing to the database, make sure the query will write safely. |
| 1749 | if ( $this->check_current_query && ! $this->check_ascii( $query ) ) { |
| 1750 | $stripped_query = $this->strip_invalid_text_from_query( $query ); |