PHP-de radio düwmeleri

Indi PHP-de radio bilen işlemegi öwreneli. Formamyzda birnäçe çalgyry düzeliň:

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 iberilenden soň, $_GET massiwinde saylanan çalgyryň value atributy bahasy ýa-da hiç zat saýlanmadyk bolsa null bolup görüner:

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

Radio bilen işleýärkäm, çekbokslardaky şol bir meselä duş gelýär. Bu meseleni çözmek üçin, gizlin inputy goşalyň:

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>

Şeýle hem gizlin inputy goşmaý, çalgyrlaryň birini deslapky görnüşde saýlanan edip goýup bolýar:

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>