complete Evaluators list + autoload

sources/PhpParser/Evaluation/IssetEvaluator.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Combodo\iTop\PhpParser\Evaluation;
+
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\ConstFetch;
+use PhpParser\Node\Expr\Isset_;
+
+class IssetEvaluator extends AbstractExprEvaluator {
+	public function GetHandledExpressionType(): ?string {
+		return Isset_::class;
+	}
+
+	public function Evaluate(Expr $oExpr): mixed {
+		/** @var Isset_ $oExpr */
+
+		foreach ($oExpr->vars as $oVar){
+			$var = PhpExpressionEvaluator::GetInstance()->EvaluateExpression($oVar);
+			if (! isset($var)){
+				return false;
+			}
+		}
+
+		return true;
+	}
+}