CascadiaPHP 2024


(PHP 5 >= 5.3.2, PHP 7, PHP 8)

realpath_cache_sizeGet realpath cache size


realpath_cache_size(): int

Get the amount of memory used by the realpath cache.


This function has no parameters.

Return Values

Returns how much memory realpath cache is using.


Example #1 realpath_cache_size() example


The above example will output something similar to:


See Also

add a note

User Contributed Notes 3 notes

Stephen Pritchard from Arcanavision
13 years ago
"realpath_cache_size" is used by PHP to cache the real file system paths of filenames referenced instead of looking them up each time. Every time you perform any of the various file functions or include/require a file and use a relative path, PHP has to look up where that file really exists. PHP caches those values so it doesn’t have to search the current working directory and include_path for the file you are working on.
If your website uses lots of relative path files, think about increasing this value. What value is required can be better estimated after monitoring by how fast the cache fills using realpath_cache_size() after restarting. Its contents can be viewed using realpath_cache_get().
superaap at gmail dot com
13 years ago
Note that the realpath cache is not used if either safe_mode is on or an open_basedir restriction is in effect.
This is having a huge performance effect, causing lots of calls to lstat.

A bugreport has already been filed at
9 years ago
Realpath_cache_size default parameter settings are too low (16k).
In the windows and Polish language assessed following be at least a 32k or 64k.
otherwise appache sometimes locks up (especially when using IE).
To Top