Fix delayed early bind if class already exists

We should not try to perform a delayed early bind if the class has
already been declared. This matches the behavior of an ordinary
early bind.

Author: nikic

Zend/tests/no_early_binding_if_already_declared.inc

@@ -0,0 +1,5 @@
+<?php
+if (class_exists(B::class)) {
+    return;
+}
+class B extends A {}

Zend/tests/no_early_binding_if_already_declared.phpt

@@ -0,0 +1,11 @@
+--TEST--
+No early binding should occur if the class is already declared
+--FILE--
+<?php
+class A {}
+class B extends A {}
+include __DIR__ . '/no_early_binding_if_already_declared.inc';
+?>
+===DONE===
+--EXPECT--
+===DONE===

ext/opcache/tests/bug67215.phpt

@@ -25,4 +25,4 @@ unlink($file_c);
 unlink($file_p);
 ?>
 --EXPECTF--
-Fatal error: Cannot declare class c, because the name is already in use in %sbug67215.c.php on line %d
+Fatal error: Cannot declare class p, because the name is already in use in %sbug67215.p.php on line %d

ext/opcache/zend_accelerator_util_funcs.c

@@ -320,18 +320,21 @@ static void zend_accel_do_delayed_early_binding(
 	CG(in_compilation) = 1;
 	for (uint32_t i = 0; i < persistent_script->num_early_bindings; i++) {
 		zend_early_binding *early_binding = &persistent_script->early_bindings[i];
-		zval *zv = zend_hash_find_known_hash(EG(class_table), early_binding->rtd_key);
-		if (zv) {
-			zend_class_entry *ce = Z_CE_P(zv);
-			zend_class_entry *parent_ce =
-				zend_hash_find_ex_ptr(EG(class_table), early_binding->lc_parent_name, 1);
-			if (parent_ce) {
-				ce = zend_try_early_bind(ce, parent_ce, early_binding->lcname, zv);
-				if (ce && early_binding->cache_slot != (uint32_t) -1) {
-					*(void**)((char*)run_time_cache + early_binding->cache_slot) = ce;
+		zend_class_entry *ce = zend_hash_find_ex_ptr(EG(class_table), early_binding->lcname, 1);
+		if (!ce) {
+			zval *zv = zend_hash_find_known_hash(EG(class_table), early_binding->rtd_key);
+			if (zv) {
+				zend_class_entry *orig_ce = Z_CE_P(zv);
+				zend_class_entry *parent_ce =
+					zend_hash_find_ex_ptr(EG(class_table), early_binding->lc_parent_name, 1);
+				if (parent_ce) {
+					ce = zend_try_early_bind(orig_ce, parent_ce, early_binding->lcname, zv);
 				}
 			}
 		}
+		if (ce && early_binding->cache_slot != (uint32_t) -1) {
+			*(void**)((char*)run_time_cache + early_binding->cache_slot) = ce;
+		}
 	}
 	CG(compiled_filename) = orig_compiled_filename;
 	CG(in_compilation) = orig_in_compilation;