PHP clearstatcache() Function

Example

Output file size, truncate file, clear cache, and then output file size again:

<?php
//output 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

Definition and Usage

The clearstatcache() function clears the file status cache.

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

Syntax

clearstatcache( clear_realpath_cache, filename)

Parameter Values

Parameter	Description
clear_realpath_cache	Optional. Indicates whether to clear the realpath cache or not. Default is FALSE, which indicates not to clear realpath cache
filename	Optional. Specifies a filename, and clears the realpath and cache for that file only

Tips and Notes

Tip: Functions that are caching:

Technical Details

Return Value:	Nothing
PHP Version:	4.0+
PHP Changelog:	PHP 5.3 - Added two optional parameters: clear_realpath_cahe and filename

❮ PHP Filesystem Reference