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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 |
|---|---|
| 2225 | * Filters the database query. |
| 2226 | * |
| 2227 | * Some queries are made before the plugins have been loaded, |
| 2228 | * and thus cannot be filtered with this method. |
| 2229 | * |
| 2230 | * @since 2.1.0 |
| 2231 | * |
| 2232 | * @param string $query Database query. |
| 2233 | */ |
| 2234 | $query = apply_filters( 'query', $query ); |
| 2235 | |
| 2236 | if ( ! $query ) { |
| 2237 | $this->insert_id = 0; |
| 2238 | return false; |
| 2239 | } |
| 2240 | |
| 2241 | $this->flush(); |
| 2242 | |
| 2243 | // Log how the function was called. |