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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 |
|---|---|
| 1907 | * Filters the database query. |
| 1908 | * |
| 1909 | * Some queries are made before the plugins have been loaded, |
| 1910 | * and thus cannot be filtered with this method. |
| 1911 | * |
| 1912 | * @since 2.1.0 |
| 1913 | * |
| 1914 | * @param string $query Database query. |
| 1915 | */ |
| 1916 | $query = apply_filters( 'query', $query ); |
| 1917 | |
| 1918 | if ( ! $query ) { |
| 1919 | $this->insert_id = 0; |
| 1920 | return false; |
| 1921 | } |
| 1922 | |
| 1923 | $this->flush(); |
| 1924 | |
| 1925 | // Log how the function was called. |