Detailed explanation of PHP clearstatcache() function_PHP tutorial

Definition and usage
The function of clearstatcache() is to clear the file status cache.
PHP’s cached data is very beneficial for running functions faster and better. If a file is tested multiple times in a script, you might disable caching of correct results. To achieve this, you can use the clearstatcache() function.
Syntax
clearstatcache()
Tips and Notes
Tip: Functions that perform caching:
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()
Case

Copy code The code is as follows:

//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");
?>

The above code will output the following result:
792100

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