如何清除标题错误

Question

im having a problem with my code in uploading and displaying images.. well I am planning to redirect the page after the upload process is done so I used a header function but gave warning and errors and unfortunately failed the upload.. how can I remove it? here's the code..

<?php 

//connect to the database//
$con = mysql_connect("localhost","root", "");
if(!$con)
{
 die('Could not connect to the database:' . mysql_error());
 echo "ERROR IN CONNECTION";
}

 $sel = mysql_select_db("imagedatabase");
if(!$sel)
{
die('Could not connect to the database:' . mysql_error());
echo "ERROR IN CONNECTION";
}
//file properties//

$file = $_FILES['image']['tmp_name']; 

echo '<br />';

 /*if(!isset($file))
    echo "Please select your images";

else
{
 */for($count = 0; $count < count($_FILES['image']); $count++)
{
//$image = file_get_contents($_FILES['image']['tmp_name']);
$image_desc[$count] = addslashes($_POST['imageDescription'][$count]);
$image_name[$count] = addslashes($_FILES['image]']['name'][$count]); echo '<br \>';
$image_size[$count] = @getimagesize($_FILES['image']['tmp_name'][$count]);
$error[$count] = $_FILES['image']['error'][$count];

if($image_size[$count] === FALSE  || ($image_size[$count]) == 0)
    echo "That's not an image";
else
{

// Temporary file name stored on the server
 $tmpName[$count]  = $_FILES['image']['tmp_name'][$count];

  // Read the file
   $fp[$count]   = fopen($tmpName[$count], 'r');
   $data[$count] = fread($fp[$count], filesize($tmpName[$count]));
   $data[$count] = addslashes($data[$count]);
   fclose($fp[$count]);


 // Create the query and insert
 // into our database.

 $results = mysql_query("INSERT INTO images( description, image) VALUES                 ('$image_desc[$count]','$data[$count]')", $con);

    if(!$results)
    echo "Problem uploding the image. Please check your database";  
   //else 
   //{
      echo "";
    //$last_id = mysql_insert_id();
    //echo "Image Uploaded. <p /> <p /><img src=display.php?    id=$last_id>";
    //header('Lcation: display2.php?id=$last_id');
        }
     //}
}


mysql_close($con);
header('Location: fGallery.php');
?>

the header function supposedly directs me to another page that would make a gallery.. here is the code..

<?php

//connect to the database//
    mysql_connect("localhost","root", "") or die(mysql_error());
    mysql_select_db("imagedatabase") or die(mysql_error());

    //requesting image id




    $image = mysql_query("SELECT * FROM images ORDER BY id DESC");


    while($row = mysql_fetch_assoc($image))
    {
         foreach ($row as $img) echo '<img src="img.php?id='.$img["id"].'">';
    }

    mysql_close();


?>

I have also a problem with my gallery .. some help will be GREAT! THANKS! :D

Answer 1

The header() function must be called before any other echo or die calls which produce output.

You may could buffer your outputs if you need the output, but in your case it makes no difference because the output will never be shown to the user. The browser will read the redirect and navigate to the second page.

---

<?php 

//connect to the database//
$con = mysql_connect("localhost","root", "");
if(!$con) {
 // this output is okay the redirect will never be reached.
 die('Could not connect to the database:' . mysql_error());
 // remember after a die this message will never be shown!
 echo "ERROR IN CONNECTION";
}

 $sel = mysql_select_db("imagedatabase");
if(!$sel) {
die('Could not connect to the database:' . mysql_error());
echo "ERROR IN CONNECTION"; // same here with the die!
}
//file properties//

$file = $_FILES['image']['tmp_name']; 

// OUTPUT
// echo '<br />';

// removed out commented code

for($count = 0; $count < count($_FILES['image']); $count++)
{
$image_desc[$count] = addslashes($_POST['imageDescription'][$count]);
$image_name[$count] = addslashes($_FILES['image]']['name'][$count]);
// OUTPUT
// echo '<br \>';
$image_size[$count] = @getimagesize($_FILES['image']['tmp_name'][$count]);
$error[$count] = $_FILES['image']['error'][$count];

if($image_size[$count] === FALSE  || ($image_size[$count]) == 0)
// you may better use a die if you want to prevent the redirection
    echo "That's not an image";
else
{

// Temporary file name stored on the server
 $tmpName[$count]  = $_FILES['image']['tmp_name'][$count];

  // Read the file
   $fp[$count]   = fopen($tmpName[$count], 'r');
   $data[$count] = fread($fp[$count], filesize($tmpName[$count]));
   $data[$count] = addslashes($data[$count]);
   fclose($fp[$count]);


 // Create the query and insert
 // into our database.

 $results = mysql_query("INSERT INTO images( description, image) VALUES                 ('$image_desc[$count]','$data[$count]')", $con);

    if(!$results) // use die
    echo "Problem uploding the image. Please check your database";  
// OUTPUT
//      echo "";
        }
}


mysql_close($con);
header('Location: fGallery.php');
?>

Above I marked every output for you and also removed all outcomments lines.

Answer 2

You've got a header error because you printed out <br /> before the header function. In order to use the header function you can't print out any information before it. That's why you're getting the error.

Regarding your gallery the foreach loop is unnecessary. You can change the code to this:

while($row = mysql_fetch_assoc($image)) {
     echo '<img src="img.php?id='.$row["id"].'">';
}

Answer 3

您可以使用ob_start()获取缓冲区中的数据。