php获取表单的值

<?php
header("Content-type: text/html; charset=utf-8");
if ($_POST[‘submit‘] != " "){
    echo $_POST[‘user‘];
    echo $_POST[‘pwd‘];
    echo $_POST[‘sex‘];
    echo $_POST[‘select‘];
    for ($i=0;$i<count($_POST[‘mrbook‘]);$i++){
        echo $_POST[‘mrbook‘][$i];
    }
    echo $_POST[‘file‘];
    echo $_POST[‘txt‘];
    
}
?>

<form name="from1" method="post" action="">
<div>
    姓名:<input type="text" name="user" value="">
</div>
<div>
    密码:<input type="password" name="pwd" value="">
</div>
<div>
    性别: <input type="radio" name="sex" value="男" checked="">男
    <input type="radio" name="sex" value="女">女
</div>
<div>
    学历:
    <select name="select" id="">
        <option value="初中">初中</option>
        <option value="高中">高中</option>
        <option value="大学生">大学生</option>
    </select>
</div>
<div>
    爱好
<input type="checkbox" name="mrbook[]" value="跑步">跑步
<input type="checkbox" name="mrbook[]" value="听歌">听歌
<input type="checkbox" name="mrbook[]" value="看电影">看电影
<input type="checkbox" name="mrbook[]" value="游泳">游泳
</div>
<div>
    个人照片    <input type="file" name="file" value="">
</div>
<div>
    <div>个人简介</div> 
    <textarea name="txt" id="" cols="30" rows="10"></textarea>
</div>
<input type="submit" name="submit" value=" 提交">
</form>