The realpath_cache_size() function is an inbuilt function in PHP that allows you to get or set the size of the realpath cache in bytes.
Syntax:
realpath_cache_size(): int
Parameter: This function does not accept any parameters.
Return Value: This function returns the current size of the real path cache in bytes.
Example 1: The following program demonstrates the  realpath_cache_size() function.
PHP
<?php $cache_size = realpath_cache_size(); echo "The current size of the realpath cache is " .       $cache_size . " bytes."; ?> |
Output:
The current size of the realpath cache is 538 bytes.
Example 2: The following program demonstrates the realpath_cache_size() function.
PHP
<?php $threshold = 10485760; $cache_size = realpath_cache_size();   if ($cache_size > $threshold) {     echo "The current size of the realpath cache         is greater than the threshold."; } else {     echo "The current size of the realpath cache is less         than or equal to the threshold."; } ?> |
Output:
The current size of the realpath cache is less than or equal to the threshold.
Reference: https://www.php.net/manual/en/function.realpath-cache-size.php
