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PHP clearstatcache() Function

PHP Filesystem Reference 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

PHP Filesystem Reference Complete PHP Filesystem Reference
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