Fixed bug #75698

NEWS

@@ -8,6 +8,7 @@ PHP                                                                        NEWS
 - Opcache:
   . Fixed bug #75687 (var 8 (TMP) has array key type but not value type).
     (Laruence)
+  . Fixed bug #75698 (Using @ crashes php7.2-fpm). (Nikita)
 
 - PGSQL:
   . Fixed bug #75671 (pg_version() crashes when called on a connection to

ext/opcache/Optimizer/dce.c

@@ -311,9 +311,7 @@ static zend_bool try_remove_var_def(context *ctx, int free_var, int use_chain, z
 				case ZEND_ASSIGN_BW_XOR:
 				case ZEND_ASSIGN_POW:
 				case ZEND_PRE_INC:
-				case ZEND_POST_INC:
 				case ZEND_PRE_DEC:
-				case ZEND_POST_DEC:
 				case ZEND_PRE_INC_OBJ:
 				case ZEND_POST_INC_OBJ:
 				case ZEND_PRE_DEC_OBJ:

ext/opcache/tests/bug75698.phpt

@@ -0,0 +1,31 @@
+--TEST--
+Bug #75698: Using @ crashes php7.2-fpm
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.optimization_level=-1
+--SKIPIF--
+<?php require_once('skipif.inc'); ?>
+--FILE--
+<?php
+
+function test() {
+  $a = array("a","b","c","b");
+  $b = array();
+  foreach ($a as $c)
+    @$b[$c]++; // the @ is required to crash PHP 7.2.0
+  var_dump($b);
+}
+
+test();
+
+?>
+--EXPECT--
+array(3) {
+  ["a"]=>
+  int(1)
+  ["b"]=>
+  int(2)
+  ["c"]=>
+  int(1)
+}