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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 |
|---|---|
| 1503 | * Filter the database query. |
| 1504 | * |
| 1505 | * Some queries are made before the plugins have been loaded, |
| 1506 | * and thus cannot be filtered with this method. |
| 1507 | * |
| 1508 | * @since 2.1.0 |
| 1509 | * |
| 1510 | * @param string $query Database query. |
| 1511 | */ |
| 1512 | $query = apply_filters( 'query', $query ); |
| 1513 | |
| 1514 | $return_val = 0; |
| 1515 | $this->flush(); |
| 1516 | |
| 1517 | // Log how the function was called |
| 1518 | $this->func_call = "\$db->query(\"$query\")"; |
| 1519 | |
| 1520 | // Keep track of the last query for debug.. |
| 1521 | $this->last_query = $query; |