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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 |
|---|---|
| 653 | * @return int|false Number of rows affected/selected or false on error |
| 654 | */ |
| 655 | function query($query) { |
| 656 | if ( ! $this->ready ) |
| 657 | return false; |
| 658 | |
| 659 | // filter the query, if filters are available |
| 660 | // NOTE: some queries are made before the plugins have been loaded, and thus cannot be filtered with this method |
| 661 | if ( function_exists('apply_filters') ) |
| 662 | $query = apply_filters('query', $query); |
| 663 | |
| 664 | // initialise return |
| 665 | $return_val = 0; |
| 666 | $this->flush(); |
| 667 | |
| 668 | // Log how the function was called |
| 669 | $this->func_call = "\$db->query(\"$query\")"; |
| 670 | |
| 671 | // Keep track of the last query for debug.. |