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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 |
|---|---|
| 831 | $modes = array_change_key_case( $modes, CASE_UPPER ); |
| 832 | |
| 833 | /** |
| 834 | * Filter the list of incompatible SQL modes to exclude. |
| 835 | * |
| 836 | * @since 3.9.0 |
| 837 | * |
| 838 | * @param array $incompatible_modes An array of incompatible modes. |
| 839 | */ |
| 840 | $incompatible_modes = (array) apply_filters( 'incompatible_sql_modes', $this->incompatible_modes ); |
| 841 | |
| 842 | foreach( $modes as $i => $mode ) { |
| 843 | if ( in_array( $mode, $incompatible_modes ) ) { |
| 844 | unset( $modes[ $i ] ); |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | $modes_str = implode( ',', $modes ); |
| 849 | |