https://s8a.jp/php-security-1#%E3%81%BE%E3%81%A8%E3%82%81
https://hacknote.jp/archives/180/
https://qiita.com/knife0125/items/0e1af52255e9879f9332
http://wordpress.honobono-life.info/svrmng/%E3%82%BB%E3%82%AD%E3%83%A5%E3%83%AA%E3%83%86%E3%82%A3%E3%82%92%E8%80%83%E6%85%AE%E3%81%97%E3%81%9Fetcphp-ini%E3%81%AE%E8%A8%AD%E5%AE%9A/
https://wepicks.net/phpsecurity-directive/
http://web.showjin.me/php_setting.html