PHP-da Radio Tugmalar

Keling, endi PHP-da radio bilan ishlashni o'rganaylik. Formamizda bir nechta o'zgartirish tugmalarini yaratamiz:

html<form action="" method="GET">
  <input type="radio" name="radio" value="1">
  <input type="radio" name="radio" value="2">
  <input type="radio" name="radio" value="3">
  <input type="submit">
</form>

Forma yuborilgandan so'ng $_GET o'zgartirish tugmasi belgilangan o'zgartirish tugmasining value atributi qiymatini o'z ichiga oladi, yoki null, agar hech narsa belgilanmagan bo'lsa:

html<?php
  var_dump($_GET['radio']); // '1', '2', '3' yoki null
?>

Radio bilan ishlashda, chekbokslardagi muammo takrorlanadi. Ushbu muammoni hal qilish uchun keling, yashirin kirish maydonini qo'shamiz:

html<form action="" method="GET">
  <input type="hidden" name="radio" value="0">
  <input type="radio"  name="radio" value="1">
  <input type="radio"  name="radio" value="2">
  <input type="radio"  name="radio" value="3">
  <input type="submit">
</form>

Yashirin kirish maydonini qo'shmasdan ham, o'zgartirish tugmalaridan birini standart sifatida belgilash mumkin:

html<form action="" method="GET">
  <input type="radio" name="radio" value="1" checked>
  <input type="radio" name="radio" value="2">
  <input type="radio" name="radio" value="3">
  <input type="submit">
</form>