php 动态生成表单的解决办法

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<?php
/**
 * 动态生成表单
 *
 * @param 
 * @arrange （www.idcnote.com）
 **/
define('VALID_NOT_EMPTY', '/.+/');
define('VALID_EMAIL', "/^[a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+(?:[a-z]{2,4}|museum|travel)$/i");
define('ALPHANUMERIC', '/[^a-zA-Z0-9]/');

function displayForm($form, $function) {
$errors = array();

if (!empty($_POST))
{
// Validate form and post it
foreach ($form['fields'] as $field => $options)
{
if (is_array($options) && !empty($options['rule']))
{
// Remove all non-alphanumeric characters for the id/name
$name = preg_replace(ALPHANUMERIC, null, strtolower($field));

if (!preg_match($options['rule'], $_POST[$name]))
{
$errors[] = $field;
}
}
}

if (empty($errors)) {
call_user_func($function, $_POST);
}
}

if (!empty($errors) || empty($_POST))
{
//Display any errors
if (!empty($errors))
{
echo '<div class="errors">';
echo 'There was an error processing your form, please check the following fields and resubmit:';

echo '<ul>';
foreach($errors as $field)
{
echo sprintf('<li>%s</li>', $field);
}
echo '</ul>';
echo '</div>';
}

// Display the form
echo '<form method="post" action="#">';

foreach ($form['fields'] as $field => $options)
{
// PHP will make the array key the keys index if it's not an array
$name = is_array($options) ? $field : $options;

// Remove all non-alphanumeric characters for the id/name
$form_name = preg_replace(ALPHANUMERIC, null, strtolower($name));

if ($form['escape'] == true) $name = htmlspecialchars($name);

echo sprintf('<label for="%s">%s: </label>', $form_name, $name);

// Default is a standard text input
if (!is_array($options) || !isset($options['type']) || $options['type'] == 'text')
{
echo sprintf('<input type="text" id="%s" name="%s" value="%s" />', $form_name, $form_name, $_POST[$form_name]);
} elseif ($options['type'] == 'textarea') {
echo sprintf('<textarea id="%s" name="%s" cols="%s" rows="%s">%s</textarea>', $form_name, $form_name, $options['cols'], $options['rows'], $_POST[$form_name]);
} elseif ($options['type'] == 'select') {
echo sprintf('<select id="%s" name="%s">', $form_name, $form_name);
foreach ($options['items'] as $item)
{
if ($form['escape'] == true) $item = htmlspecialchars($item);

echo sprintf('<option value="%s">%s</option>', $item, $item);
}
echo '</select>';
}
echo '<br />'. "\n";
}

echo '<input type="submit" value="Send" />';
echo '</form>';
}
}
?>

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