how to disable content sniffing code example

Example 1: how to fix input field and disabled

<input type="text" readonly="readonly" />

Example 2: how to disable opcache

/etc/php5.5-sp/conf.d/opcache.ini
/etc/php5.6-sp/conf.d/opcache.ini
/etc/php7.0-sp/conf.d/opcache.ini
/etc/php7.1-sp/conf.d/opcache.ini
/etc/php7.2-sp/conf.d/opcache.ini
/etc/php7.3-sp/conf.d/opcache.ini
/etc/php7.4-sp/conf.d/opcache.ini

opcache.enable=0
sudo service php5.5-fpm-sp restart