1 files changed, 40 insertions, 2 deletions

diff --git a/Zend/zend_execute_API.c b/Zend/zend_execute_API.c
index e2410cf6af..80d0cf26ee 100644
--- a/Zend/zend_execute_API.c
+++ b/Zend/zend_execute_API.c
@@ -488,6 +488,37 @@ ZEND_API const char *get_active_function_name(void) /* {{{ */
 }
 /* }}} */
 
+ZEND_API const char *get_active_function_arg_name(uint32_t arg_num) /* {{{ */
+{
+	zend_function *func;
+
+	if (!zend_is_executing()) {
+		return NULL;
+	}
+
+	func = EG(current_execute_data)->func;
+
+	return get_function_arg_name(func, arg_num);
+}
+/* }}} */
+
+ZEND_API const char *get_function_arg_name(const zend_function *func, uint32_t arg_num) /* {{{ */
+{
+	if (!func || func->common.num_args < arg_num) {
+		return NULL;
+	}
+
+	switch (func->type) {
+		case ZEND_USER_FUNCTION:
+			return ZSTR_VAL(func->common.arg_info[arg_num - 1].name);
+		case ZEND_INTERNAL_FUNCTION:
+			return ((zend_internal_arg_info*) func->common.arg_info)[arg_num - 1].name;
+		default:
+			return NULL;
+	}
+}
+/* }}} */
+
 ZEND_API const char *zend_get_executed_filename(void) /* {{{ */
 {
 	zend_execute_data *ex = EG(current_execute_data);
@@ -717,11 +748,18 @@ int zend_call_function(zend_fcall_info *fci, zend_fcall_info_cache *fci_cache) /
 				} else if (!ARG_MAY_BE_SENT_BY_REF(func, i + 1)) {
 					/* By-value send is not allowed -- emit a warning,
 					 * but still perform the call with a by-value send. */
+					const char *arg_name = get_function_arg_name(func, i + 1);
+
 					zend_error(E_WARNING,
-						"Parameter %d to %s%s%s() expected to be a reference, value given", i+1,
+						"%s%s%s() expects argument #%d%s%s%s to be passed by reference, value given",
 						func->common.scope ? ZSTR_VAL(func->common.scope->name) : "",
 						func->common.scope ? "::" : "",
-						ZSTR_VAL(func->common.function_name));
+						ZSTR_VAL(func->common.function_name),
+						i+1,
+						arg_name ? " ($" : "",
+						arg_name ? arg_name : "",
+						arg_name ? ")" : ""
+					);
 					if (UNEXPECTED(EG(exception))) {
 						ZEND_CALL_NUM_ARGS(call) = i;
 						zend_vm_stack_free_args(call);