Validating a radio button
<?php
$choices = array('eggs' => 'E',
'toast' => 'T',
'coffee' => 'C');
foreach ($choices as $key => $choice) {
echo "<input type='radio' name='food' value='$key'/> $choice \n";
}
if (! array_key_exists($_POST['food'], $choices)) {
echo "You must select a valid choice.";
}
?>
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