Fatal error when phpinfo is disabled

[maxmilash]

Bug report

If you put the phpinfo function in disabled_functions and try to analyze phpstan with php8.0, it will throw the next error

PHP Fatal error: Uncaught Error: Call to undefined function phpinfo() in phar:.../vendor/phpstan/phpstan/phpstan.phar/vendor/react/child-process/src/Process.php:373

There is the next code where it throw error attempting to call phpinfo function

    /**
     * Return whether PHP has been compiled with the '--enable-sigchild' option.
     *
     * @see \Symfony\Component\Process\Process::isSigchildEnabled()
     * @return bool
     */
    public static final function isSigchildEnabled()
    {
        if (null !== self::$sigchild) {
            return self::$sigchild;
        }
        \ob_start();
        \phpinfo(\INFO_GENERAL);
        return self::$sigchild = \false !== \strpos(\ob_get_clean(), '--enable-sigchild');
    }

In the comments to the method there is a reference to a similar method from the Symfony class, where the disabled phpinfo state is provided https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/Process/Process.php#L1377

    protected function isSigchildEnabled()
    {
        if (null !== self::$sigchild) {
            return self::$sigchild;
        }

        if (!\function_exists('phpinfo')) {
            return self::$sigchild = false;
        }

        ob_start();
        phpinfo(\INFO_GENERAL);

        return self::$sigchild = false !== strpos(ob_get_clean(), '--enable-sigchild');
    }

Since phpinfo is disabled for security purposes in my case, is it possible to add this behavior to phpstan?
Ready to send a Pull Request

Thank you for your time, checking this issue.

Code snippet that reproduces the problem

---

Expected output

No fatal error

[mergeable]

This bug report is missing a link to reproduction on phpstan.org.

It will most likely be closed after manual review.

[staabm]

Sounds like you should report it to react/child-process

[maxmilash]

Thanks. Created a report to react/child-process
I will keep you informed

[ondrejmirtes]

Updated react/child-process here: phpstan/phpstan-src@ca3aad0

Feel free to test dev-master of phpstan/phpstan.

Thanks.

[github-actions]

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