PHP clearstatcache() Function

Complete PHP Filesystem Reference

Definition and Usage

The clearstatcache() function clears the file status cache.

PHP caches data for some functions for better performance. If a file is being checked several times in a script, you might want to avoid caching to get correct results. To do this, use the clearstatcache() function.

Syntax

clearstatcache()

Tips and Notes

Tip: Functions that are 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()

Example

<?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 again
clearstatcache();
echo filesize("test.txt");
?>

The output of the code above could be:

792
100

Complete PHP Filesystem Reference

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