5.4 表单元素

   <?php
$options = array("010"  => "北京",
"020" => "上海",
"024"  => "沈阳",
"0411"  => "大连");
$default = "024";
$html = generate_radio_group("city_id", $options, $default);
echo $html;
function generate_radio_group($name, $options, $default="") {
$name = htmlentities($name);
foreach($options as $value => $label) {
$value = htmlentities($value);
$html .= "<INPUT TYPE=\"RADIO\" ";
if ($value == $default){
$html .= "CHECKED ";
}
$html .= "NAME=\"$name\" VALUE=\"$value\">";
$html .= $label . "<br>";
}
return($html);
}
?>

   <?php
function generate_checkboxes($name,$options, $default=array()) {
if (!is_array($default)){
$default = array();
}
foreach($options as $value => $label) {
$html .= "<input type=checkbox ";
if (in_array($value, $default)){
$html .= "checked ";
}
$html .= "name=\"{$name}[]\" value=\"$value\">";
$html .= $label . "<br>";
}
return($html);
}

$interests = array("音乐"  => "音乐",
"电影" => "电影",
"互联网"  => "互联网",
"旅游"  => "旅游");
$html = generate_checkboxes("interests",$options, $interests);
?>
选择您的爱好：
<form action="interests.php" method=post>
<?php echo $html;?>
<input type=submit value="继续">
</form>

   <?php 
$options = array( 
'1' => '请选择', 
'news' => '新闻', 
'events' => '事件', 
'publications' => '稿件' 
); 
$default = "news";  //默认已选择的项
$html =generate_muilti_option("select", $options, $default);
echo $html;

function generate_muilti_option ($name,$options, $default){
//建立一个允许多选的列表单
echo '<select name="'.$name.'[]" id="'.$name.'[]" multiple=
"multiple">'; 
foreach( $options as $value => $option ) { 
echo '<option value="' . htmlspecialchars( $value ) . '"' ; 
if( $default == $value ) { 
echo ' selected'; 
} 
echo '>' . htmlspecialchars( $option ) . '</option>';
} 
echo '</select>'; 
}
?>