bug78903.diff

diff --git a/Zend/zend_compile.c b/Zend/zend_compile.c
index b6a120c94b..5ba10b794c 100644
--- a/Zend/zend_compile.c
+++ b/Zend/zend_compile.c
@@ -5917,7 +5917,7 @@ static void zend_begin_func_decl(znode *result, zend_op_array *op_array, zend_as
 		return;
 	}
 
-	key = zend_build_runtime_definition_key(lcname, decl->lex_pos);
+	key = zend_build_runtime_definition_key(lcname, (unsigned char*)(decl->lex_pos - LANG_SCNG(yy_start)));
 	zend_hash_update_ptr(CG(function_table), key, op_array);
 
 	if (op_array->fn_flags & ZEND_ACC_CLOSURE) {
@@ -6555,7 +6555,7 @@ zend_op *zend_compile_class_decl(zend_ast *ast, zend_bool toplevel) /* {{{ */
 			return opline;
 		}
 	} else {
-		zend_string *key = zend_build_runtime_definition_key(lcname, decl->lex_pos);
+		zend_string *key = zend_build_runtime_definition_key(lcname, (unsigned char*)(decl->lex_pos - LANG_SCNG(yy_start)));
 
 		/* RTD key is placed after lcname literal in op1 */
 		zend_add_literal_string(&key);

bug78903.php

<?php
$tmp = __DIR__ . "/bug65915.inc.php";

file_put_contents($tmp, '<?php return function(){ return function() {return "a";};};');
$f1 = require $tmp;
var_dump($f1()());
//var_dump(opcache_invalidate($tmp, true));

file_put_contents($tmp, '<?php return function(){ return function() {return "b";};};');
$f2 = require $tmp;
var_dump($f1()(), $f2()());

@unlink($tmp);
?>