Throw an error if an empty string is passed to getParamater() or hasParameter()

Author: ollieread

ext/reflection/php_reflection.c

@@ -2152,6 +2152,11 @@ ZEND_METHOD(ReflectionFunctionAbstract, hasParameter)
         RETURN_FALSE;
     }
 
+    if (ZSTR_LEN(arg_name) != 0) {
+        zend_argument_value_error(1, "must not be an empty string");
+        RETURN_THROWS();
+    }
+
     if (arg_name != NULL) {
         if (get_parameter_position(fptr, arg_name, num_args) > -1) {
             RETURN_TRUE;
@@ -2197,6 +2202,11 @@ ZEND_METHOD(ReflectionFunctionAbstract, getParameter)
         RETURN_THROWS();
     }
 
+    if (ZSTR_LEN(arg_name) != 0) {
+        zend_argument_value_error(1, "must not be an empty string");
+        RETURN_THROWS();
+    }
+
     if (arg_name != NULL) {
         position = get_parameter_position(fptr, arg_name, num_args);