From cfd4d3df0bf6397b80108f6e2d144afbb55e0763 Mon Sep 17 00:00:00 2001
From: Joe Watkins <krakjoe@php.net>
Date: Sat, 22 May 2021 11:06:45 +0200
Subject: [PATCH] Fix #77627 method_exists on Closure::__invoke

---
 NEWS                          |  2 ++
 Zend/tests/bug77627.phpt      | 15 +++++++++++++++
 Zend/zend_builtin_functions.c | 10 ++++++++--
 3 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 Zend/tests/bug77627.phpt

diff --git a/NEWS b/NEWS
index 845382bb53c..1e97f1dd876 100644
--- a/NEWS
+++ b/NEWS
@@ -8,6 +8,8 @@ PHP                                                                        NEWS
 - Standard:
   . Fixed bug #81048 (phpinfo(INFO_VARIABLES) "Array to string conversion").
     (cmb)
+  . Fixed bug #77627 (method_exists on Closure::__invoke inconsistency).
+    (krakjoe)
 
 03 Jun 2021, PHP 8.0.7
 
diff --git a/Zend/tests/bug77627.phpt b/Zend/tests/bug77627.phpt
new file mode 100644
index 00000000000..a67a8c2fad7
--- /dev/null
+++ b/Zend/tests/bug77627.phpt
@@ -0,0 +1,15 @@
+--TEST--
+Fix for #77627 method_exists on Closure::__invoke without object returns false
+--FILE--
+<?php
+var_dump(method_exists(Closure::class, "__invoke"));
+var_dump(method_exists(Closure::class, "__INVOKE"));
+
+$closure = function(){};
+
+var_dump(method_exists($closure, "__INVOKE"));
+?>
+--EXPECT--
+bool(true)
+bool(true)
+bool(true)
diff --git a/Zend/zend_builtin_functions.c b/Zend/zend_builtin_functions.c
index 5ec365c9205..eea925feee4 100644
--- a/Zend/zend_builtin_functions.c
+++ b/Zend/zend_builtin_functions.c
@@ -950,9 +950,9 @@ ZEND_FUNCTION(method_exists)
 		func = Z_OBJ_HT_P(klass)->get_method(&obj, method_name, NULL);
 		if (func != NULL) {
 			if (func->common.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE) {
-				/* Returns true to the fake Closure's __invoke */
+				/* Returns true for the fake Closure's __invoke */
 				RETVAL_BOOL(func->common.scope == zend_ce_closure
-					&& zend_string_equals_literal(method_name, ZEND_INVOKE_FUNC_NAME));
+					&& zend_string_equals_literal_ci(method_name, ZEND_INVOKE_FUNC_NAME));
 
 				zend_string_release_ex(func->common.function_name, 0);
 				zend_free_trampoline(func);
@@ -960,6 +960,12 @@ ZEND_FUNCTION(method_exists)
 			}
 			RETURN_TRUE;
 		}
+	} else {
+	    /* Returns true for fake Closure::__invoke */
+	    if (ce == zend_ce_closure
+	        && zend_string_equals_literal_ci(method_name, ZEND_INVOKE_FUNC_NAME)) {
+	        RETURN_TRUE;
+	    }
 	}
 	RETURN_FALSE;
 }