How can I disable notices and warnings in PHP within the .htaccess file?

You can disable notices and warnings in PHP by adding the following line to your .htaccess file:

php_flag display_errors off

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Alternatively, you can use the following line to only disable notices:

error_reporting(E_ALL ^ E_NOTICE);

You can also use the following line to disable warnings:

error_reporting(E_ALL ^ E_WARNING);

You should also be aware that these changes will only work if your PHP is running as an Apache module, if you are using FastCGI or PHP-FPM, you will have to make these changes in the corresponding configuration files.