更新

api/bing/counter.dat

@@ -1 +0,0 @@
-4

api/bing/index.php

@@ -1,10 +1,12 @@
 <?php
-     $counter = intval(file_get_contents("counter.dat"));  
-     $_SESSION['#'] = true;  
-     $counter++;  
-     $fp = fopen("counter.dat","w");  
-     fwrite($fp, $counter);  
-     fclose($fp);
+$file = 'counter.dat';
+
+// 读取并自增
+$counter = (int)@file_get_contents($file);
+$counter++;
+
+// 使用 LOCK_EX 防止并发写入冲突
+file_put_contents($file, $counter, LOCK_EX);
      
      header('Access-Control-Allow-Origin:*');
      $str = file_get_contents('http://cn.bing.com/HPImageArchive.aspx?idx=0&n=1');