Bug #62956: fixing private method signature validation

In inheritance, if both methods are private, don not enforce the same
signature.

Author: lstrojny

Zend/tests/bug61761.phpt

@@ -14,5 +14,6 @@ class B extends A
 }
 
 ?>
+==DONE==
 --EXPECTF--
-Strict Standards: Declaration of B::test() should be compatible with A::test($a) in %sbug61761.php on line %d
+==DONE==

Zend/tests/bug62956.phpt

@@ -0,0 +1,20 @@
+--TEST--
+Bug #62956: "incompatible" signatures for private methods should not cause E_STRICT
+--FILE--
+<?php
+class Base
+{
+	private function test()
+	{}
+}
+
+class Extension extends Base
+{
+	private function test($arg)
+	{}
+}
+
+?>
+==DONE==
+--EXPECT--
+==DONE==

Zend/zend_compile.c

@@ -2935,6 +2935,11 @@ static zend_bool zend_do_perform_implementation_check(const zend_function *fe, c
 		return 1;
 	}
 
+	/* If both methods are private do not enforce a signature */
+    if ((fe->common.fn_flags & ZEND_ACC_PRIVATE) && (proto->common.fn_flags & ZEND_ACC_PRIVATE)) {
+		return 1;
+	}
+
 	/* check number of arguments */
 	if (proto->common.required_num_args < fe->common.required_num_args
 		|| proto->common.num_args > fe->common.num_args) {