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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 |
|---|---|
| 1075 | * @param string $query Database query |
| 1076 | * @return int|false Number of rows affected/selected or false on error |
| 1077 | */ |
| 1078 | function query( $query ) { |
| 1079 | if ( ! $this->ready ) |
| 1080 | return false; |
| 1081 | |
| 1082 | // some queries are made before the plugins have been loaded, and thus cannot be filtered with this method |
| 1083 | if ( function_exists( 'apply_filters' ) ) |
| 1084 | $query = apply_filters( 'query', $query ); |
| 1085 | |
| 1086 | $return_val = 0; |
| 1087 | $this->flush(); |
| 1088 | |
| 1089 | // Log how the function was called |
| 1090 | $this->func_call = "\$db->query(\"$query\")"; |
| 1091 | |
| 1092 | // Keep track of the last query for debug.. |
| 1093 | $this->last_query = $query; |