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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 |
|---|---|
| 2547 | * Passing a non-null value to the filter will short-circuit |
| 2548 | * checking the DB for the charset, returning that value instead. |
| 2549 | * |
| 2550 | * @since 4.2.0 |
| 2551 | * |
| 2552 | * @param string $charset The character set to use. Default null. |
| 2553 | * @param string $table The name of the table being checked. |
| 2554 | * @param string $column The name of the column being checked. |
| 2555 | */ |
| 2556 | $charset = apply_filters( 'pre_get_col_charset', null, $table, $column ); |
| 2557 | if ( null !== $charset ) { |
| 2558 | return $charset; |
| 2559 | } |
| 2560 | |
| 2561 | // Skip this entirely if this isn't a MySQL database. |
| 2562 | if ( empty( $this->is_mysql ) ) { |
| 2563 | return false; |
| 2564 | } |
| 2565 | |