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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 |
|---|---|
| 1190 | return false; |
| 1191 | /** |
| 1192 | * Filter the database query. |
| 1193 | * |
| 1194 | * Some queries are made before the plugins have been loaded, and thus cannot be filtered with this method. |
| 1195 | * |
| 1196 | * @since 2.1.0 |
| 1197 | * @param string $query Database query. |
| 1198 | */ |
| 1199 | $query = apply_filters( 'query', $query ); |
| 1200 | |
| 1201 | $return_val = 0; |
| 1202 | $this->flush(); |
| 1203 | |
| 1204 | // Log how the function was called |
| 1205 | $this->func_call = "\$db->query(\"$query\")"; |
| 1206 | |
| 1207 | // Keep track of the last query for debug.. |
| 1208 | $this->last_query = $query; |