PHP 7 clearstatcache() Function
❮ PHP Filesystem ReferenceExample
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 | 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:
- 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()
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
