memory usage increasing when using opcache.enable_cli and opcache.file_cache_only

Description

The below script using opcache.enable_cli=1 and opcache.file_cache_only=1 causes the PHP memory usage to continue to increase. If I disable file_cache_only, then the memory usage remains constant. I was able to reproduce in PHP 8.1, 8.2, and 7.4.

To reproduce, set-up scripts test.php and test2.php as listed below, create an empty directory /tmp/opcache, and then run:

php \
  -n \
  -d "zend_extension=opcache" \
  -d "opcache.enable_cli=1" \
  -d "opcache.file_cache=/tmp/opcache" \
  -d "opcache.file_cache_only=1" \
  test.php

When I run the above, the value of memory_get_usage() continues to increase. If I remove the line for "opcache.file_cache_only=1", then memory_get_usage() remains constant.

If it doesn't happen the 1st time, then try running it a 2nd time.

Can you please check why the memory usage continues to grow in this scenario?

Thanks for your help.

test.php:

<?php
for ($i = 0; $i < 10000; $i++)
{
	echo number_format(memory_get_usage())."\n";

	require('test2.php');
}

test2.php:

<?php
return;

PHP Version

PHP 8.1.11

Operating System

AlmaLinux 8

首先使用 opcache.enable_cli=1 和 opcache.file_cache_only=1 运行提供的 test.php 和 test2.php 脚本，然后将 memory_get_usage() 与禁用 file_cache_only 时的结果进行比较。调查重复 require test2.php 时涉及的 PHP opcache 文件缓存路径；当报告的增长得到解释且复现不再显示内存持续增长时，即表示完成。