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PHP Quiz PHP CertificatePHP 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");
?>
//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
100
Complete PHP Filesystem Reference
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