如何在注册用户之前检查空字段和照片文件提示?如何使复选框和选项成为必需 - How to check empty fields AND photo file tipe before registering user? How can I make checkbokes and options required?

How to check empty fields AND photo file tipe before registering user? How can I make checkbokes and options required?

我在我的webiste上做了一个注册表。我已经要求填写姓名和电子邮件(对我来说很容易，因为是文本字段(，但我如何才能要求填写国家、照片和爱好？现在，我想在添加数据库和上传到服务器之前检查空字段和文件类型。我该怎么做？谢谢

    <?php
      if (isset($_POST['submit'])){
      if (empty($_POST["name"]) || empty($_POST["email"])) {
         $emptyErr = "   Required field!";   // Error which will be shown if a field is empty
         $name = $_POST['name']; // I put this field to remember user entries if a field is empty
         $email = $_POST['email'];
         } else {
         $con = mysql_connect("localhost","username","password"); // Connect to database
         if (!$con){
             die("Can not connect: " . mysql_error());
         }
         mysql_select_db("database_name",$con);
          $target = "gallery/profilepictures/";  // Folder for pictures on server
          $pic=(time().'_'.$_FILES['photo']['name']); // I wanna rename the pictures on server. I put time in front of original name
         $hobbies = implode(", ",$_POST['hobbies']);

         $hot = "INSERT INTO table_name (name,email,country,hobbies,default_img)
         VALUES ('$_POST[name]','$_POST[email]','$_POST[country]','$hobbies','$pic')";
         mysql_query($hot,$con);
          //Writes the photo to the server 
        if(move_uploaded_file($_FILES['photo']['tmp_name'], $target . $pic)) 
        { 
         //Tells you if its all ok 
         echo "The file ". basename( $_FILES['photo']['name']). " has been uploaded, and your information has been added to the directory"; 
         } 
         else { 
         //Gives and error if its not 
         echo "Oops! Error! Try again!"; 
         } 

      }
      }

      ?>

      <form enctype="multipart/form-data" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post">
<table style="width:700px">
<tr><td>Name:</td><td><input type="edit" name="name" size="50" value="<? echo $name?>"><?php  if (empty($_POST["name"])) {echo $emptyErr;}?></td></tr>
<tr><td>Email:</td><td><input type="edit" name="email" size="50" value="<? echo $email?>"><?php  if (empty($_POST["email"])) {echo $emptyErr;}?></td></tr>
<tr><td>Country:</td><td><select name="country"><option value="USA" selected>USA</option>
                                              <option value="UK">UK</option>
                                              <option value="UAE">UAE</option>
                                              </select></td></tr>
<tr><td>Photo:</td><td><input type="file" name="photo"></td></tr>
<tr><td>Hobbies:</td><td><input type="checkbox" name="hobbies[]" value="football">football
                          <input type="checkbox" name="hobbies[]" value="tennis">tennis
                          <input type="checkbox" name="hobbies[]" value="carting">carting
                          <input type="checkbox" name="hobbies[]" value="online games">online games
                          </td></tr>
<tr><td colspan=2><input type="submit" name="submit" class="btn btn-custom2 radius fr" value="Adăugați unitatea de cazare &raquo;"></td></tr>
<tr><td>&nbsp;</td></tr>
</table>
      </form>

为了检查文件大小和类型，可以使用类似的

if($_FILES["imagefile"]["size"] >= 2120000) {
  echo "Max size exceeded";
  die();
}else {
    $imageData = @getimagesize($_FILES["imagefile"]["tmp_name"]);
    if($imageData === FALSE || !($imageData[2] == IMAGETYPE_GIF || $imageData[2] == IMAGETYPE_JPEG || $imageData[2] == IMAGETYPE_PNG)) {
      echo "Invalid file type";
      die();
    }
}

如果您只需要服务器端检查空字段，则可以使用

if(!empty($PostedData))
  //allow
else
  echo "Field(s) missing."; 
die();