You need to add the lines given below in the .htaccess file if you want your PHP errors within the error_log file instead of the .logs folder –
# log PHP errors to a file
php_flag log_errors on
php_value error_reporting 32767
php_value error_log "error_log.txt"
Ensure that you take the backup of your existing .htaccess file before making any changes. Incorrect .htaccess may cause an issue with your website, making it inaccessible.