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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 | 
|---|---|
| 856 |           $modes = array_change_key_case( $modes, CASE_UPPER ); | 
| 857 |  | 
| 858 |           /** | 
| 859 |            * Filters the list of incompatible SQL modes to exclude. | 
| 860 |            * | 
| 861 |            * @since 3.9.0 | 
| 862 |            * | 
| 863 |            * @param array $incompatible_modes An array of incompatible modes. | 
| 864 |            */ | 
| 865 |           $incompatible_modes = (array) apply_filters( 'incompatible_sql_modes', $this->incompatible_modes ); | 
| 866 |  | 
| 867 |           foreach ( $modes as $i => $mode ) { | 
| 868 |                if ( in_array( $mode, $incompatible_modes ) ) { | 
| 869 |                     unset( $modes[ $i ] ); | 
| 870 |                } | 
| 871 |           } | 
| 872 |  | 
| 873 |           $modes_str = implode( ',', $modes ); | 
| 874 |  |