Db: add parse_pdo_dsn() helper method

src/Db.php

@@ -469,4 +469,22 @@ class Db {
           $row[$field] = $this -> date2time($row[$field]);
     return $row;
   }
+
+  /**
+   * Helper method to parse PHP PDO DSN info
+   * @param string $dsn  PHP PDO DSN to parse
+   * @return array|false
+   */
+  public static function parse_pdo_dsn($dsn) {
+    if (!preg_match('/^([^:]+):(.+)$/', $dsn, $dsn_parts))
+      return false;
+
+    $info = ['protocol' => $dsn_parts[1]];
+    foreach(preg_split('/;+/', $dsn_parts[2]) as $part) {
+      if (preg_match('/^([^=]+)=(.*)$/', $part, $dsn_part))
+        $info[$dsn_part[1]] = $dsn_part[2];
+    }
+    Log::trace('parse_pdo_dsn(%s): %s', $dsn, vardump($info));
+    return $info;
+  }
 }