https://bugs.xdebug.org/view.php?id=1609

dfa.diff

diff --git a/xdebug.c b/xdebug.c
index 7442222f..d937b462 100644
--- a/xdebug.c
+++ b/xdebug.c
@@ -1187,11 +1187,26 @@ static void xdebug_overloaded_functions_restore(TSRMLS_D)
 PHP_RINIT_FUNCTION(xdebug)
 {
        char *idekey;
+       zend_long optimizer;
 
 #if defined(ZTS) && defined(COMPILE_DL_XDEBUG)
        ZEND_TSRMLS_CACHE_UPDATE();
 #endif
 
+       if ((optimizer = INI_INT("opcache.optimization_level"))) {
+               zend_string *key = zend_string_init(ZEND_STRL("opcache.optimization_level"), 1);
+               zend_string *value;
+
+               optimizer &= ~(1<<5);
+
+               value = strpprintf(0, "0x%08X", optimizer);
+
+               zend_alter_ini_entry(key, value, ZEND_INI_SYSTEM, ZEND_INI_STAGE_STARTUP);
+
+               zend_string_release(key);
+               zend_string_release(value);
+       }
+
        /* Get the ide key for this session */
        XG(ide_key) = NULL;
        idekey = xdebug_env_key(TSRMLS_C);