phpmyadmin error when change php version from 8.3 to 7.1 (ubuntu 20.04)?

i have follow Have trouble installing phpmyadmin on PHP7 Apache/2.4.7 (Ubuntu) solution to install phpmyadmin,

my php version :PHP Version 7.1.33-58+ubuntu22.04.1+deb.sury.org+1
but localhost phpmyadmin showing blank page and get the error message from apache2 as below,

\[Wed Apr 24 02:00:01.299308 2024\] \[php7:emerg\] \[pid 342407\] \[client 192.168.131:13086\] PHP Parse error:  syntax error, unexpected '|', expecting variable (T_VARIABLE) in /usr/share/php/Symfony/Component/DependencyInjection/ContainerBuilder.php on line 312

and the 312 line on ContainerBuilder.php show as below,

public function addObjectResource(object|string $object)

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