Magento 2 :- Magento upgrade error 2.4.4 in php 8.1

Question

When i run this command i got error

php bin/magento maintenance:enable

PHP Deprecated: Return type of phpseclib_mcrypt_filter::filter($in, $out, &$consumed, $closing) should either be compatible with php_user_filter::filter($in, $out, &$consumed, bool $closing): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in vendor/phpseclib/mcrypt_compat/lib/mcrypt.php on line 1107

PHP Deprecated: Return type of phpseclib_mcrypt_filter::onCreate() should either be compatible with php_user_filter::onCreate(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in vendor/phpseclib/mcrypt_compat/lib/mcrypt.php on line 1158

• Deexit Sanghani: Have you found any solution of this problem?
• Alex: run composer update

Answer 1

mcrypt module is depricated and seems to be enforced from php 8.1

Try below steps-

1. Check if mcrypt module is there using

   php -m

2. If mcrypt module is listed, disable it in php8.1

3. Restart php

4. Verify magento cmd now.

• Murtaza Bharmal: I don't have mcrypt module listed. What should I do then? And I am using docker container.

Answer 2

First update the mcrypt module which is compatible with php 8.1

Check Here - https://github.com/phpseclib/mcrypt_compat

Answer 3

add below line above function defination at line 1107

#[\ReturnTypeWillChange]
public function filter($in, $out, &$consumed, $closing)
{