From f27298c927488fea7cd0541331473e9c5b2311b1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=93=9D=E5=B0=8F=E7=81=B0?= <xiaohui.lan@e.hexdata.cn>
Date: Mon, 13 Nov 2017 11:04:43 +0800
Subject: [PATCH] with php5.* syntax

---
 src/Editable.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Editable.php b/src/Editable.php
index 6c95787..0ab945b 100644
--- a/src/Editable.php
+++ b/src/Editable.php
@@ -94,7 +94,7 @@ public function __construct($row = null, $pk = "id", $hidden = [], $ajax = '')
             throw new EditableException(null, EditableException::NO_DATA);
 
         $this->row      = $row;
-        $this->pk       = $this->row[$pk] ?? null;
+        $this->pk       = isset($this->row[$pk]) ? $this->row[$pk] : null;
         $this->hidden   = array_flip($hidden);
         $this->ajax     = $ajax;