以下是关于php fread()函数报错的代码！有无高手指点一下哦！

Question

Warning: fread() [function.fread]: Length parameter must be greater than 0 in E:\xampp\xampp\htdocs\temp\index.php on line 4fread()函数报错·<?php$dir = "../huion/cache/array_cache/index/template_data.cache.php";$fp = fopen($dir,"w");$data = fread($fp,filesize($dir));fclose($fp);?> 这是源代码

Answer 1

$dir = "../huion/cache/array_cache/index/template_data.cache.php";
这个文件是空的 或者不存在吧

Answer 2

$data = ($filesize = filesize($dir)) ? fread($fp, $filesize) : "";