You want to make sure only valid checkboxes are checked.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="EN" lang="EN">
<head>
<title>PHP</title>
<meta Name="Author" Content="Hann So">
</head>
<body>
<p>
<?php
$fruits = array('red Apples'=>'Apples', 'green Grapes'=>'Grapes', 'yellow Bananas'=>'Bananas');
function display_form($array) {
echo <<<HTML
<form action = "$_SERVER[PHP_SELF]" method="post">
<input type ='checkbox' name='fruit[]' value='None' />None<br />
HTML;
foreach ($array as $key =>$choice) {
echo "<input type ='checkbox' name='fruit[]' value='$key' />$choice<br />";
}
echo <<<EOF
</select>
<input type="submit" value="Submit" />
</form>
EOF;
}
// make sure the array exists
if (is_array($_POST['fruit'])) {
// array_intersect() finds allof the elements in $_POST['fruit']
// that are also in array_keys($fruits)
if (array_intersect($_POST['fruit'], array_keys($fruits)) == $_POST['fruit']) {
foreach ($_POST['fruit'] as $value) {
echo "Your selection is $value<br />";
}
}
else {
echo "Select a valid choice.";
display_form($fruits);
}
} else {
display_form($fruits);
}
?>
</p>
</body>
</html>
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