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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 |
|---|---|
| 2202 | * Filters the database query. |
| 2203 | * |
| 2204 | * Some queries are made before the plugins have been loaded, |
| 2205 | * and thus cannot be filtered with this method. |
| 2206 | * |
| 2207 | * @since 2.1.0 |
| 2208 | * |
| 2209 | * @param string $query Database query. |
| 2210 | */ |
| 2211 | $query = apply_filters( 'query', $query ); |
| 2212 | |
| 2213 | if ( ! $query ) { |
| 2214 | $this->insert_id = 0; |
| 2215 | return false; |
| 2216 | } |
| 2217 | |
| 2218 | $this->flush(); |
| 2219 | |
| 2220 | // Log how the function was called. |