From cb9b2b5803370bdbfbfe1c0b27f85f8f41113dcd Mon Sep 17 00:00:00 2001
From: thinkphp <thinkphp@qq.com>
Date: Tue, 18 Oct 2016 16:19:06 +0800
Subject: [PATCH] =?UTF-8?q?Cache=E7=B1=BB=E5=A2=9E=E5=8A=A0remember?=
 =?UTF-8?q?=E6=96=B9=E6=B3=95=20=E7=94=A8=E4=BA=8E=E5=BD=93=E8=8E=B7?=
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---
 library/think/cache/Driver.php | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/library/think/cache/Driver.php b/library/think/cache/Driver.php
index e0aeb7bc..a2a57795 100644
--- a/library/think/cache/Driver.php
+++ b/library/think/cache/Driver.php
@@ -109,6 +109,27 @@ abstract class Driver
         }
     }
 
+    /**
+     * 如果不存在则写入缓存
+     * @access public
+     * @param string    $name 缓存变量名
+     * @param mixed     $value  存储数据
+     * @param int       $expire  有效时间 0为永久
+     * @return mixed
+     */
+    public function remember($name, $value, $expire = null)
+    {
+        if (!$this->has($name)) {
+            if ($value instanceof \Closure) {
+                $value = call_user_func($value);
+            }
+            $this->set($name, $value, $expire);
+        } else {
+            $value = $this->get($name);
+        }
+        return $value;
+    }
+
     /**
      * 缓存标签
      * @access public