fix: importing mysql db tables into mariadb/wp-env

plugins/cm4all-wp-impex/inc/impex-import-extension-db-table.php

@@ -208,6 +208,21 @@ interface DbTableImporter
 function __registerDbTableImportProvider()
 {
   $provider = Impex::getInstance()->Import->addProvider(DbTableImporter::PROVIDER_NAME, __NAMESPACE__ . '\__DbTableImportProviderCallback');
+
+  global $wpdb;
+  $db_version = $wpdb->get_row('SHOW VARIABLES LIKE "version_comment"', ARRAY_A)['Value'] ?? 'MySQL';
+
+  if (stripos($db_version, 'mariadb') !== false) {
+    // we need to replace legacy utf8 encodings with just utf8 and the matching collation in create table statements when importing tables from a mysqldb export to mariadb
+    // see https://tecadmin.net/resolved-unknown-collation-utf8mb4_0900_ai_ci/
+    \add_filter('query', function (string $sql) {
+      $sql = str_replace('utf8mb4_0900_ai_ci', 'utf8_general_ci', $sql);
+      $sql = str_replace('utf8mb4', 'utf8', $sql);
+
+      return $sql;
+    });
+  }
+
   return $provider;
 }