diff --git a/src/Php/AstNodeType.php b/src/Php/AstNodeType.php
index 8c651d11..a1aac1b9 100644
--- a/src/Php/AstNodeType.php
+++ b/src/Php/AstNodeType.php
@@ -102,12 +102,12 @@ trait AstNodeType
 
     protected function isScalarBool(NodeAbstract $expr): bool
     {
-        return $expr instanceof Expr\ConstFetch and in_array($expr->name->toString(), ['true', 'false']);
+        return $expr instanceof Expr\ConstFetch and in_array(strtolower($expr->name->toString()), ['true', 'false']);
     }
 
     protected function getBoolValue(Expr\ConstFetch $expr): string
     {
-        return $expr->name->toString() === 'true' ? self::VALUE_TRUE : self::VALUE_FALSE;
+        return strcasecmp($expr->name->toString(), 'true') === 0 ? self::VALUE_TRUE : self::VALUE_FALSE;
     }
 
     protected function isMatchExpr(NodeAbstract $expr): bool
@@ -175,6 +175,6 @@ trait AstNodeType
 
     protected function isNull(NodeAbstract $expr): bool
     {
-        return $expr instanceof Expr\ConstFetch && $expr->name->toString() === 'null';
+        return $expr instanceof Expr\ConstFetch && strcasecmp($expr->name->toString(), 'null') === 0;
     }
 }
diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index aec62adb..11db8417 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -1419,6 +1419,9 @@ class CompilerBase extends \PhpAot\Core\Translator
                 case 'Stmt_Class':
                     $this->fatalError($v, 'Cannot declare class in function');
                     break;
+                case 'Stmt_Function':
+                    $this->fatalError($v, 'Cannot declare function in function');
+                    break;
                 default:
                     abort($v);
                     break;
@@ -3550,13 +3553,13 @@ class CompilerBase extends \PhpAot\Core\Translator
                 return $this->getConstant($importedName);
             }
         }
-        if ($name === 'null') {
+        if (strcasecmp($name, 'null') === 0) {
             return self::VALUE_NULL;
         }
-        if ($name === 'true') {
+        if (strcasecmp($name, 'true') === 0) {
             return 'true';
         }
-        if ($name === 'false') {
+        if (strcasecmp($name, 'false') === 0) {
             return 'false';
         }
         if ($name === 'PHP_EOL') {
@@ -4151,10 +4154,10 @@ class CompilerBase extends \PhpAot\Core\Translator
         if ($this->isInternalConstant($name)) {
             return $this->getTypeFromZendType(gettype($this->internalConstants[$name]));
         }
-        if ($name === 'true') {
+        if (strcasecmp($name, 'true') === 0) {
             return self::TYPE_BOOL;
         }
-        if ($name === 'false') {
+        if (strcasecmp($name, 'false') === 0) {
             return self::TYPE_BOOL;
         }
         if ($name === 'NAN' or $name === 'INF') {
diff --git a/tests/aot/array/008.phpt b/tests/aot/array/008.phpt
new file mode 100644
index 00000000..b3594e05
--- /dev/null
+++ b/tests/aot/array/008.phpt
@@ -0,0 +1,17 @@
+--TEST--
+Array 007
+--FILE--
+<?php
+$bool_values = array (true => true, false => false, TRUE => TRUE, FALSE => FALSE);
+$temp_array = $bool_values;
+var_dump(krsort($temp_array) );
+var_dump($temp_array);
+?>
+--EXPECT--
+bool(true)
+array(2) {
+  [1]=>
+  bool(true)
+  [0]=>
+  bool(false)
+}
\ No newline at end of file