add fcache, and test file

Author: lloydzhou

fcache.php

@@ -0,0 +1,15 @@
+<?php
+function fcache ($cachedir='/tmp/', $expire=100){
+    return function ($key, $val=null, $exp=100) use ($cachedir, $expire){
+        $timestamp = time();
+        $name = $cachedir. $key. '-'. md5($key);
+        $expire = $exp || $expire;
+        if ($name && $val && $expire){
+            @file_put_contents($name, serialize($val), LOCK_EX);
+            @touch($name, $timestamp + $expire);
+            return $val;
+        }
+        return file_exists($name) && @filemtime($name) > $timestamp
+            && ($data=unserialize(@file_get_contents($name))) ? $data : null;
+    };
+}

test.php

@@ -0,0 +1,16 @@
+<?php
+include "fcache.php";
+
+$cache = fcache('./', 1);
+
+// set cache
+// will see file named "name-b068931cc450442b63f5b3d276ea4297" with content 's:5:"value";'
+$cache('name', 'value');
+// get cache
+echo $cache('name');
+sleep(1);
+// cache expire
+echo $cache('name') ?: "\r\ncan not get cache!";
+
+
+