PHP clearstatcache () function

Definition and Usage

clearstatcache () function clears the file status cache.

PHP will return cached information for certain functions in order to provide higher performance. But sometimes, like checking the same file multiple times in a script, and the script file during the execution risk of being deleted or modified, you need to clear the cache file status, in order to obtain correct results. To do this, use the clearstatcache () function.

grammar

clearstatcache()

 

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Tips and Notes

Tip: function caching, namely by clearstatcache () function affects the function:

• 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()

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Examples

<?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 above will output:

792
100

 

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