Change mysql CLI call to native PHP function (#158)

* Change mysql CLI call to native PHP function

* Silent phpcs to allow for MySQL functions usage

* Silence silencing errors.

* Handle exception instead of supressing error

* Add comment explaining the approach

* Adjust label to make it more clear

Author: wojtekn

src/Config_Command.php

@@ -153,16 +153,18 @@ public function create( $_, $assoc_args ) {
 			WP_CLI::error( '--dbprefix can only contain numbers, letters, and underscores.' );
 		}
 
-		$mysql_db_connection_args = [
-			'execute' => ';',
-			'host'    => $assoc_args['dbhost'],
-			'user'    => $assoc_args['dbuser'],
-			'pass'    => $assoc_args['dbpass'],
-		];
-
-		// Check DB connection.
+		// Check DB connection. To make command more portable, we are not using MySQL CLI and using
+		// mysqli directly instead, as $wpdb is not accessible in this context.
 		if ( ! Utils\get_flag_value( $assoc_args, 'skip-check' ) ) {
-			Utils\run_mysql_command( '/usr/bin/env mysql --no-defaults', $mysql_db_connection_args );
+			// phpcs:disable WordPress.DB.RestrictedFunctions
+			$mysql = mysqli_init();
+			mysqli_report( MYSQLI_REPORT_STRICT );
+			try {
+				mysqli_real_connect( $mysql, $assoc_args['dbhost'], $assoc_args['dbuser'], $assoc_args['dbpass'] );
+			} catch ( mysqli_sql_exception $exception ) {
+				die( 'Database connection error (' . $exception->getCode() . ') ' . $exception->getMessage() );
+			}
+			// phpcs:enable WordPress.DB.RestrictedFunctions
 		}
 
 		if ( ! Utils\get_flag_value( $assoc_args, 'skip-salts' ) ) {