https://hsnww.com/technology-programming/%d8%a8%d8%b1%d9%85%d8%ac%d8%a9-php/%d8%ac%d9%85%d9%84%d8%a9-%d8%a7%d9%84%d8%aa%d8%a8%d8%af%d9%8a%d9%84-%d8%a7%d9%84%d8%b4%d8%b1%d8%b7%d9%8a%d8%a9-switch-case-%d9%81%d9%8a-php/