db_table_exists($table)
Checks if a table exists.
string $table: The name of the table in drupal (no prefixing).
bool TRUE if the given table exists, otherwise FALSE.
as of Drupal 8.0.x, will be removed in Drupal 9.0.0. Instead, get a database connection injected into your service from the container, get its schema driver, and call tableExists() on it. For example, $injected_database->schema()->tableExists($table);
\Drupal\Core\Database\Schema::tableExists()
function db_table_exists($table) { return Database::getConnection()->schema()->tableExists($table); }
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https://api.drupal.org/api/drupal/core!includes!database.inc/function/db_table_exists/8.1.x