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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 |
|---|---|
| 1540 | * Filter the database query. |
| 1541 | * |
| 1542 | * Some queries are made before the plugins have been loaded, |
| 1543 | * and thus cannot be filtered with this method. |
| 1544 | * |
| 1545 | * @since 2.1.0 |
| 1546 | * |
| 1547 | * @param string $query Database query. |
| 1548 | */ |
| 1549 | $query = apply_filters( 'query', $query ); |
| 1550 | |
| 1551 | $this->flush(); |
| 1552 | |
| 1553 | // Log how the function was called |
| 1554 | $this->func_call = "\$db->query(\"$query\")"; |
| 1555 | |
| 1556 | // Keep track of the last query for debug.. |
| 1557 | $this->last_query = $query; |
| 1558 | |