Adding simple opt arguments related routines

helpers.inc.php

@@ -1135,6 +1135,29 @@ if(!function_exists('str_ends_with'))
   }
 }
 
+function arg_opt(array &$args, $opt, $default, $conv_fn = null)
+{
+  foreach($args as $idx => $arg)
+  {
+    if(strpos($arg, $opt) === 0)
+    {
+      $arg = substr($arg, strlen($opt));
+      unset($args[$idx]);
+      return $conv_fn === null ? $arg : $conv_fn($arg);
+    }
+  }
+  return $default;
+}
+
+function arg_opt_check_no_trailing(array $args)
+{
+  foreach($args as $arg)
+  {
+    if(preg_match('~(--\w+)=.*~', $arg, $m))
+      throw new Exception("Unknown option '{$m[1]}'");
+  }
+}
+
 function are_you_sure()
 {
   echo "Are you sure you want to proceed?(type YES): ";