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PHP新手教程: clearstatcache() 函数详解_PHP

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Release: 2016-06-01 12:20:43
Original
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定义和用法

clearstatcache()函数的作用是:清除文件状态缓存。

PHP的缓存数据对更快更好的运行函数是非常有利的。如果一个文件在脚本中测试了多次,你也许会禁止对正确的结果进行缓存。为了实现这点,你可以使用clearstatcache()函数。

语法

clearstatcache()

提示和注意

提示:执行缓存的函数:

stat()
lstat()
file_exists()
is_writable()
is_readable()
is_executable()
is_file()
is_dir()
is_link()
filectime()
fileatime()
filemtime()
fileinode()
filegroup()
fileowner()
filesize()
filetype()
fileperms()

案例

//check filesize
echo filesize("test.txt");
echo "
";
$file = fopen("test.txt", "a+");
// truncate file
ftruncate($file,100);
fclose($file);//Clear cache and check filesize againcle
arstatcache();
echo filesize("test.txt");
?>

上述代码将输出下面的结果:

792100

source:php.cn
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