diff --git a/bin/gen_stub.php b/bin/gen_stub.php
index 7ddaeae7..dd7d7a08 100755
--- a/bin/gen_stub.php
+++ b/bin/gen_stub.php
@@ -2329,6 +2329,18 @@ class EvaluatedValue
                     return null;
                 }
 
+                global $definedConstants;
+                if (isset($definedConstants[$constName])) {
+                    $constValue = $definedConstants[$constName];
+                    if (is_scalar($constValue)) {
+                        if (is_string($constValue)) {
+                            return '"' . $constValue . '"';
+                        } else {
+                            return $constValue;
+                        }
+                    }
+                }
+
                 throw new Exception("Constant " . $constName . " cannot be found");
             }
         );
@@ -6098,7 +6110,7 @@ function initPhpParser() {
 
 function main()
 {
-    global $argv, $argc, $translator;
+    global $argv, $argc, $translator, $definedConstants;
 
     error_reporting(E_ALL & ~E_DEPRECATED);
     ini_set("precision", "-1");
@@ -6108,6 +6120,8 @@ function main()
     $translator->setIndent("\t");
     $translator->setIndentLevel(1);
 
+    $definedConstants = get_defined_constants();
+
     $opt_index = 0;
     $options = getopt(
         "fh",
diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index ae5820d5..8f300203 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -249,13 +249,9 @@ class CompilerBase extends \PhpAot\Core\Translator
             case 'Expr_Empty':
                 return $this->parseEmpty($expr);
             case 'Expr_Assign':
-                $result = $this->parseAssign($expr);
-
-                return $result;
+                return $this->parseAssign($expr);
             case 'Expr_AssignRef':
-                $result = $this->parseAssignRef($expr);
-
-                return $result;
+                return $this->parseAssignRef($expr);
             case 'Expr_Print':
                 return $this->parsePrint($expr);
             case 'Expr_BinaryOp_Equal':
@@ -960,8 +956,10 @@ class CompilerBase extends \PhpAot\Core\Translator
         $checkVarFn = function ($var) {
             if ($this->isArrayDimFetch($var)) {
                 $array = $this->parseIdentifier($var->var);
-                if (!$this->hasVar($array)) {
-                    $this->addLocalVar($array, self::TYPE_ARRAY);
+                if ($this->isVarExpr($var->var)) {
+                    if (!$this->hasVar($array)) {
+                        $this->addLocalVar($array, self::TYPE_ARRAY);
+                    }
                 }
             }
         };
@@ -1012,12 +1010,6 @@ class CompilerBase extends \PhpAot\Core\Translator
         if ($right->getType() === 'Expr_Assign') {
             return $this->parseRightAssociativeAssign($left, $right);
         }
-        if ($this->isArrayDimFetch($left)) {
-            return $this->parseAssignArrayDim($left, $right);
-        }
-        if ($this->isStaticPropertyFetch($left)) {
-            return $this->parseAssignStaticProperty($left, $right);
-        }
         return $this->parseFinallyAssign($left, $right);
     }
 
@@ -1683,12 +1675,18 @@ class CompilerBase extends \PhpAot\Core\Translator
     protected function parseArrayDimFetch(Node\Expr\ArrayDimFetch $node, bool $write): string
     {
         $var = $this->parseIdentifier($node->var);
-        if ($this->isVarExpr($node->var) and $var === 'GLOBALS') {
-            if ($node->dim === null) {
-                $this->fatalError($node, 'Cannot use [] for GLOBALS');
+        if ($this->isVarExpr($node->var)) {
+            if (!$this->hasVar($var)) {
+                $this->fatalError($node->var, "The variable `{$node->var->name}` is undefined");
+            }
+            if ($var === 'GLOBALS') {
+                if ($node->dim === null) {
+                    $this->fatalError($node, 'Cannot use [] for GLOBALS');
+                }
+                return 'php::global(' . $this->parseIdentifier($node->dim) . ')';
             }
-            return 'php::global(' . $this->parseIdentifier($node->dim) . ')';
         }
+
         if ($node->dim === null) {
             if (!$write) {
                 $this->fatalError($node, 'Cannot use [] for reading');