Merge branch 'PHP-7.4'

* PHP-7.4:
  Similar problem (#79022) also exists in Interfaces
  Fixed bug #79022 (class_exists returns True for classes that are not ready to be used)

Author: laruence

Zend/tests/bug79022.phpt

@@ -0,0 +1,39 @@
+--TEST--
+Bug #79022 (class_exists returns True for classes that are not ready to be used)
+--FILE--
+<?php
+function my_autoloader($class) {
+    if (class_exists('Foo', 0)) {
+		new Foo();
+    }
+	if ($class == 'Foo') {
+		eval("class Foo extends Bar{}");
+	}
+
+	if ($class == 'Bar') {
+		eval("class Bar {}");
+    }
+
+	if ($class == 'Dummy') {
+		eval ("class Dummy implements iFoo {}");
+	}
+
+
+	if (interface_exists('iFoo', 0)) {
+		new Dummy();
+	}
+	if ($class == 'iFoo') {
+		eval ("interface iFoo extends iBar {}");
+	}
+
+	if ($class == 'iBar') {
+		eval ("interface iBar {}");
+	}
+}
+spl_autoload_register('my_autoloader');
+new Foo();
+new Dummy();
+echo "okey";
+?>
+--EXPECT--
+okey

Zend/zend_builtin_functions.c

@@ -1248,7 +1248,7 @@ static inline void class_exists_impl(INTERNAL_FUNCTION_PARAMETERS, int flags, in
 	}
 
  	if (ce) {
-		RETURN_BOOL((flags == 0 || (ce->ce_flags & flags)) && !(ce->ce_flags & skip_flags));
+		RETURN_BOOL(((ce->ce_flags & flags) == flags) && !(ce->ce_flags & skip_flags));
 	} else {
 		RETURN_FALSE;
 	}
@@ -1259,15 +1259,15 @@ static inline void class_exists_impl(INTERNAL_FUNCTION_PARAMETERS, int flags, in
    Checks if the class exists */
 ZEND_FUNCTION(class_exists)
 {
-	class_exists_impl(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0, ZEND_ACC_INTERFACE | ZEND_ACC_TRAIT);
+	class_exists_impl(INTERNAL_FUNCTION_PARAM_PASSTHRU, ZEND_ACC_LINKED, ZEND_ACC_INTERFACE | ZEND_ACC_TRAIT);
 }
 /* }}} */
 
 /* {{{ proto bool interface_exists(string classname [, bool autoload])
    Checks if the class exists */
 ZEND_FUNCTION(interface_exists)
 {
-	class_exists_impl(INTERNAL_FUNCTION_PARAM_PASSTHRU, ZEND_ACC_INTERFACE, 0);
+	class_exists_impl(INTERNAL_FUNCTION_PARAM_PASSTHRU, ZEND_ACC_LINKED|ZEND_ACC_INTERFACE, 0);
 }
 /* }}} */