diff --git a/NEWS b/NEWS
index 3c9ae592998..2412ad4342b 100644
--- a/NEWS
+++ b/NEWS
@@ -8,6 +8,10 @@ PHP                                                                        NEWS
 - EXIF:
   . Fixed bug #76409 (heap use after free in _php_stream_free). (cmb)
 
+- Opcache:
+  . Fixed bug #76477 (Opcache causes empty return value).
+    (Nikita, Laruence)
+
 - ZIP:
   . Fixed bug #76461 (OPSYS_Z_CPM defined instead of OPSYS_CPM).
     (Dennis Birkholz, Remi)
diff --git a/ext/opcache/Optimizer/zend_call_graph.c b/ext/opcache/Optimizer/zend_call_graph.c
index 886a7939716..a0ea479ef81 100644
--- a/ext/opcache/Optimizer/zend_call_graph.c
+++ b/ext/opcache/Optimizer/zend_call_graph.c
@@ -155,6 +155,7 @@ int zend_analyze_calls(zend_arena **arena, zend_script *script, uint32_t build_f
 			case ZEND_SEND_REF:
 			case ZEND_SEND_VAR_NO_REF:
 			case ZEND_SEND_VAR_NO_REF_EX:
+			case ZEND_SEND_USER:
 				if (call_info) {
 					uint32_t num = opline->op2.num;
 
@@ -165,9 +166,11 @@ int zend_analyze_calls(zend_arena **arena, zend_script *script, uint32_t build_f
 				}
 				break;
 			case ZEND_SEND_ARRAY:
-			case ZEND_SEND_USER:
 			case ZEND_SEND_UNPACK:
 				/* TODO: set info about var_arg call ??? */
+				if (call_info) {
+					call_info->num_args = -1;
+				}
 				break;
 		}
 		opline++;
diff --git a/ext/opcache/Optimizer/zend_func_info.c b/ext/opcache/Optimizer/zend_func_info.c
index 19b8e517306..b32a954c1f1 100644
--- a/ext/opcache/Optimizer/zend_func_info.c
+++ b/ext/opcache/Optimizer/zend_func_info.c
@@ -16,8 +16,6 @@
    +----------------------------------------------------------------------+
 */
 
-/* $Id:$ */
-
 #include "php.h"
 #include "zend_compile.h"
 #include "zend_extensions.h"
@@ -79,9 +77,11 @@ static uint32_t zend_strlen_info(const zend_call_info *call_info, const zend_ssa
 			tmp |= MAY_BE_LONG | FUNC_MAY_WARN | MAY_BE_NULL;
 		}
 		return tmp;
-	} else {
+	} else if (call_info->num_args != -1) {
 		/* warning, and returns NULL */
 		return FUNC_MAY_WARN | MAY_BE_NULL;
+	} else {
+		return MAY_BE_LONG | FUNC_MAY_WARN | MAY_BE_NULL;
 	}
 }
 
@@ -90,9 +90,11 @@ static uint32_t zend_dechex_info(const zend_call_info *call_info, const zend_ssa
 	if (call_info->caller_init_opline->extended_value == (uint32_t)call_info->num_args &&
 	    call_info->num_args == 1) {
 		return MAY_BE_RC1 | MAY_BE_STRING;
-	} else {
+	} else if (call_info->num_args != -1) {
 		/* warning, and returns NULL */
 		return FUNC_MAY_WARN | MAY_BE_NULL;
+	} else {
+		return FUNC_MAY_WARN | MAY_BE_RC1 | MAY_BE_STRING | MAY_BE_NULL;
 	}
 }
 
diff --git a/ext/opcache/tests/bug76477.phpt b/ext/opcache/tests/bug76477.phpt
new file mode 100644
index 00000000000..39bff0d46c5
--- /dev/null
+++ b/ext/opcache/tests/bug76477.phpt
@@ -0,0 +1,22 @@
+--TEST--
+Bug #76477 (Opcache causes empty return value)
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.optimization_level=-1
+--SKIPIF--
+<?php require_once('skipif.inc'); ?>
+--FILE--
+<?php
+testString();
+function testString()
+{
+	$token = "ABC";
+	$lengthBytes = strlenb($token);
+	var_dump($lengthBytes == 0);
+}
+
+function strlenb() { return call_user_func_array("strlen", func_get_args()); }
+?>
+--EXPECT--
+bool(false)