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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 |
|---|---|
| 1051 | * @param string $query Database query |
| 1052 | * @return int|false Number of rows affected/selected or false on error |
| 1053 | */ |
| 1054 | function query( $query ) { |
| 1055 | if ( ! $this->ready ) |
| 1056 | return false; |
| 1057 | |
| 1058 | // some queries are made before the plugins have been loaded, and thus cannot be filtered with this method |
| 1059 | if ( function_exists( 'apply_filters' ) ) |
| 1060 | $query = apply_filters( 'query', $query ); |
| 1061 | |
| 1062 | $return_val = 0; |
| 1063 | $this->flush(); |
| 1064 | |
| 1065 | // Log how the function was called |
| 1066 | $this->func_call = "\$db->query(\"$query\")"; |
| 1067 | |
| 1068 | // Keep track of the last query for debug.. |
| 1069 | $this->last_query = $query; |