如何在php中识别表单字段类型

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