如何在php中识别表单字段类型

HTML页面：

<form name="form" action="" method="get">

    <input type="hidden" name="fields[]" value="name:text">
    <input type="hidden" name="fields[]" value="about_me:textarea">
    <input type="hidden" name="fields[]" value="gender:radio">
    <input type="hidden" name="fields[]" value="level:select">

    <input type="text" name="name" id="name" value="My name">
    <textarea name="about_me" id="about_me"></textarea>
    <input type="radio" name="gender" value="male" />
    <input type="radio" name="gender" value="female" />

    <select name="level">
        <option value="Beginner">Beginner</option>
        <option value="Intermediate">Intermediate</option>
        <option value="Expert">Expert </option>
    </select>
</form>

然后,在您的PHP文件中：

$fields = $_POST["fields"];
foreach ($fields as $field) {
    list($name,$type) = explode(':',$field);
    $val = (!empty($_POST[$name]))?$_POST[$name]:"";
    if ($type == "textarea") {
        // do sth. useful with it
        // the value is in $val (if there's one)
    }
}