Clearstatcache in PHP

The clearstatcache () function is used to clear the File status cache.

PHP cache data is very advantageous for faster and better function running. If a file is tested in a script

After multiple attempts, you may not cache the correct results. To achieve this, you can use

Clearstatcache () function.

When Stat (), lstat (), or any function column in the affected function table (see the following figure) is used,

PHP will cache the returned information of these functions to provide faster performance. However, in some cases, you may

To clear the cached information. For example, if the same file is checked multiple times in a script

When this script is executed, you need to clear the File status cache when it is deleted or modified. This situation

You can use the clearstatcache () function to clear the file information cached by PHP.

Note that PHP does not cache the information of non-existing files. So if you call

File_exists () to check for non-existing files. Before the file is created, it will return

False. If the file is created, true is returned even if it is deleted later.

Note: This function caches the information of a specific file name. Therefore, it only performs operations on the same file name multiple times and

Clearstatcache () is called only when the file information is not cached ().

Syntax

Clearstatcache ()

Tips and notes

Tip: Execute the cache function:

Stat ()

Lstat ()

File_exists ()

Is_writable ()

Is_readable ()

Is_executable ()

Is_file ()

Is_dir ()

Is_link ()

Filectime ()

Fileatime ()

Filemtime ()

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Fileinode ()

Filegroup ()

Fileowner ()

Filesize ()

Filetype ()

Fileperms ()

Case

<? 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 againcle

Arstatcache ();

Echo filesize ("test.txt ");

?>

The above code will output the following results:

792

100