diff --git a/examples/micro_bench.php b/examples/micro_bench.php
index 1ff5a409..27c9af67 100644
--- a/examples/micro_bench.php
+++ b/examples/micro_bench.php
@@ -339,25 +339,25 @@ function main()
     $t = end_test($t, '$this->f()', $overhead);
     $x->read_const(N);
     $t = end_test($t, '$x = Foo::TEST', $overhead);
-//    create_object(N);
-//    $t = end_test($t, 'new Foo()', $overhead);
+    create_object(N);
+    $t = end_test($t, 'new Foo()', $overhead);
     read_const(N);
     $t = end_test($t, '$x = TEST', $overhead);
-//    read_auto_global(N);
-//    $t = end_test($t, '$x = $_GET', $overhead);
-//    read_global_var(N);
-//    $t = end_test($t, '$x = $GLOBALS[\'v\']', $overhead);
-//    read_hash(N);
-//    $t = end_test($t, '$x = $hash[\'v\']', $overhead);
-//    read_str_offset(N);
-//    $t = end_test($t, '$x = $str[0]', $overhead);
-//    issetor(N);
-//    $t = end_test($t, '$x = $a ?: null', $overhead);
-//    issetor2(N);
-//    $t = end_test($t, '$x = $f ?: tmp', $overhead);
-//    ternary(N);
-//    $t = end_test($t, '$x = $f ? $f : $a', $overhead);
-//    ternary2(N);
-//    $t = end_test($t, '$x = $f ? $f : tmp', $overhead);
+    read_auto_global(N);
+    $t = end_test($t, '$x = $_GET', $overhead);
+    read_global_var(N);
+    $t = end_test($t, '$x = $GLOBALS[\'v\']', $overhead);
+    read_hash(N);
+    $t = end_test($t, '$x = $hash[\'v\']', $overhead);
+    read_str_offset(N);
+    $t = end_test($t, '$x = $str[0]', $overhead);
+    issetor(N);
+    $t = end_test($t, '$x = $a ?: null', $overhead);
+    issetor2(N);
+    $t = end_test($t, '$x = $f ?: tmp', $overhead);
+    ternary(N);
+    $t = end_test($t, '$x = $f ? $f : $a', $overhead);
+    ternary2(N);
+    $t = end_test($t, '$x = $f ? $f : tmp', $overhead);
     total();
 }
diff --git a/src/Php/FuncCallOptimizer.php b/src/Php/FuncCallOptimizer.php
index 68276547..ac16f2b6 100644
--- a/src/Php/FuncCallOptimizer.php
+++ b/src/Php/FuncCallOptimizer.php
@@ -14,8 +14,11 @@ trait FuncCallOptimizer
 {
     protected function parseFuncCallWithOptimizer(string $name, Node\Expr\FuncCall $expr): string|false
     {
+        $getArg = function ($i) use ($expr) {
+            return $this->parseIdentifier($expr->args[$i]->value);
+        };
         if ($name === 'strlen' or $name === 'sizeof' or $name === 'count') {
-            return 'php::len(' . $this->parseIdentifier($expr->args[0]->value) . ')';
+            return 'php::len(' . $getArg(0) . ')';
         }
         if (count($expr->args) == 1) {
             switch ($name) {
@@ -42,7 +45,16 @@ trait FuncCallOptimizer
             }
         }
         if ($name === 'abs') {
-            return 'php::math::abs(' . $this->parseIdentifier($expr->args[0]->value) . ')';
+            return 'php::math::abs(' . $getArg(0) . ')';
+        }
+        if ($name === 'ord') {
+            return 'php::fn::ord(' . $getArg(0) . ')';
+        }
+        if ($name === 'chr') {
+            return 'php::fn::chr(' . $this->convertIntExpr($getArg(0)) . ')';
+        }
+        if ($name === 'array_key_exists') {
+            return $getArg(1) . '.offsetExists(' . $getArg(0) . ')';
         }
         if ($name === 'function_exists') {
             $funcName = $expr->args[0]->value;