Please clarify which PHP version you are using. Note that the 7.0.x branch is no longer supported.

https://www.php.net/supported-versions.php

The higher version may have the same problem. Has this bug been fixed？

Impossible to say because there is not enough information here to diagnose the problem. It could be an issue with opcache, in which case it is likely that an upgrade would fix the issue, yes.

Please note that PHP 8 is nearing release, and 7.0 has been unsupported for a long time. You really need to update PHP to a supported version as soon as possible, regardless of the issue you are currently experiencing.

Thanks

I got the same Problem.

When posting Data to a url i Get the follwoing error:
Parse error:  syntax error, unexpected identifier "version" in php://input on line 1

My XML as an example looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<cXML>
</cXML>

I am only reading the content with
$post = file_get_contents('php://input‘);

It looks like it's trying to parse it.

"Suddenly, this problem appears. After restarting php-fpm, the problem disappears. After a while, the problem reappears." - I can confirm this. After killing the container the problem is gone for a while.

My setup:
Azure Kubernetes Cluster
Apache 2.4 (Alpine)
PHP-FPM 8.0.3 (Alpine)

As an additional information:
i put a die(); into the first line to the script I am sending the post - even then the Error Mesage is shown in Postman.

I am also using opcache but also did a opcache_reset(); before the die(); - But without any canges.