clearstatcache in php

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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 may disable caching of correct results. To achieve this, you can use the
clearstatcache() function.
When using stat(), lstat(), or any of the functions listed in the affected functions table (see below),
PHP will cache the return information from these functions to provide faster performance. However, in some cases, you may
want to clear cached information. For example, if you check the same file multiple times in a script and the file is in danger of being deleted or modified during
the execution of this script, you need to clear the file status cache. In this case, you can use the clearstatcache() function to clear the file information cached by PHP.
It must be noted that PHP will not cache information for files that do not exist. So if
file_exists() is called to check for a file that does not exist, it will return
FALSE until the file is created. If the file is created, even if it is deleted later, it will return TRUE
Note: This function caches the information of a specific file name, so it only operates on the same file name multiple times and
requires the file information Clearstatcache() needs to be called only when it is not cached.
Syntax
clearstatcache()
Tips and Notes
Tip: Function that performs caching:
stat()
lstat()
file_exists()
is_writable()
is_readable()
is_executable()
is_file()
is_dir()
is_link()
filectime()
fileatime()
filemtime()
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fileinode()
filegroup()
fileowner()
filesize()
filetype()
fileperms ()
Case

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

The above code will output the following results:

792

100


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php clearstatcache() function usage details

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