Fixed bug #72762

ext/opcache/Optimizer/zend_inference.c

@@ -3139,9 +3139,6 @@ static void zend_update_type_info(const zend_op_array *op_array,
 					if (t1 & MAY_BE_ARRAY_KEY_STRING) {
 						tmp |= MAY_BE_STRING;
 					}
-					if (!(tmp & (MAY_BE_LONG|MAY_BE_STRING))) {
-						tmp |= MAY_BE_NULL;
-					}
 				}
 				UPDATE_SSA_TYPE(tmp, ssa_ops[i].result_def);
 			}

ext/opcache/tests/bug72762.phpt

@@ -0,0 +1,23 @@
+--TEST--
+Bug #72762: Infinite loop while parsing a file with opcache enabled
+--FILE--
+<?php
+
+class foo
+{
+    function bar()
+    {
+        $b = array();
+
+        foreach ($a as $a) {
+            foreach ($b as $k => $v) {
+            }
+            $b[$k] = $v;
+        }
+    }
+}
+
+?>
+===DONE===
+--EXPECT--
+===DONE===