php 动态生成表单的简单示例

感兴趣的小伙伴，下面一起跟随编程之家 jb51.cc的小编来看看吧。
经测试代码如下：

<?PHP
/**
 * 动态生成表单
 *
 * @param 
 * @arrange (编程之家) jb51.cc
 **/
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
$form_name = preg_replace(ALPHANUMERIC,strtolower($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']) || $options['type'] == 'text')
{
echo sprintf('<input type=text id=%s name=%s value=%s />',$_POST[$form_name]);
} elseif ($options['type'] == 'textarea') {
echo sprintf('<textarea id=%s name=%s cols=%s rows=%s>%s</textarea>',$options['cols'],$options['rows'],$_POST[$form_name]);
} elseif ($options['type'] == 'select') {
echo sprintf('<select id=%s name=%s>',$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>';
}
}
?>