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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 |
|---|---|
| 2739 | * Passing a non-null value to the filter will short-circuit |
| 2740 | * checking the DB for the charset, returning that value instead. |
| 2741 | * |
| 2742 | * @since 4.2.0 |
| 2743 | * |
| 2744 | * @param string $charset The character set to use. Default null. |
| 2745 | * @param string $table The name of the table being checked. |
| 2746 | * @param string $column The name of the column being checked. |
| 2747 | */ |
| 2748 | $charset = apply_filters( 'pre_get_col_charset', null, $table, $column ); |
| 2749 | if ( null !== $charset ) { |
| 2750 | return $charset; |
| 2751 | } |
| 2752 | |
| 2753 | // Skip this entirely if this isn't a MySQL database. |
| 2754 | if ( empty( $this->is_mysql ) ) { |
| 2755 | return false; |
| 2756 | } |
| 2757 | |