Warning: Cannot modify header information - headers already sent by

evoarte · #1 (**permalink**) 27/05/2014, 04:19

buenos días,

al enviar el formulario me devuelve un error:
Warning: Cannot modify header information - headers already sent by ... on line 23

a que puede ser debido?

Código PHP:

Ver original<?php 
//get unique id
$up_id = uniqid(); 
?>
 
<?php
 
//process the forms and upload the files
if ($_POST) {
 
//specify folder for file upload
$folder = "uploads/"; 
 
//specify redirect URL
$redirect = "upload.php?success";
 
//upload the file
move_uploaded_file($_FILES["file"]["tmp_name"], "$folder" . $_FILES["file"]["name"]);
 
//do whatever else needs to be done (insert information into database, etc...)
 
//redirect user
header('Location: '.$redirect); die;
}
//
 
?>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Upload your file</title>
 
<!--Progress Bar and iframe Styling-->
<link href="style_progress.css" rel="stylesheet" type="text/css" />
 
<!--Get jQuery-->
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.0/jquery.js" type="text/javascript"></script>
 
<!--display bar only if file is chosen-->
<script>
 
$(document).ready(function() { 
//
 
//show the progress bar only if a file field was clicked
    var show_bar = 0;
    $('input[type="file"]').click(function(){
        show_bar = 1;
    });
 
//show iframe on form submit
    $("#form1").submit(function(){
 
        if (show_bar === 1) { 
            $('#upload_frame').show();
            function set () {
                $('#upload_frame').attr('src','upload_frame.php?up_id=<?php echo $up_id; ?>');
            }
            setTimeout(set);
        }
    });
//
 
});
 
</script>
 
</head>
 
<body>
<h1>Upload your file </h1>
 
<div>
  <?php if (isset($_GET['success'])) { ?>
  <span class="notice">Your file has been uploaded.</span>
  <?php } ?>
  <form action="" method="post" enctype="multipart/form-data" name="form1" id="form1">
    Name<br />
    <input name="name" type="text" id="name"/>
    <br />
    <br />
    Your email address <br />
    <input name="email" type="text" id="email" size="35" />
    <br />
    <br />
    Choose a file to upload<br />
 
<!--APC hidden field-->
    <input type="hidden" name="APC_UPLOAD_PROGRESS" id="progress_key" value="<?php echo $up_id; ?>"/>
<!---->
 
    <input name="file" type="file" id="file" size="30"/>
 
<!--Include the iframe-->
    <br />
    <iframe id="upload_frame" name="upload_frame" frameborder="0" border="0" src="" scrolling="no" scrollbar="no" > </iframe>
    <br />
<!---->
 
    <input name="Submit" type="submit" id="submit" value="Submit" />
  </form>
  </div>
 
</body>
 
</html>

un saludo,
josé carlos.

pzin · #2 (**permalink**) 27/05/2014, 04:41

No cierres las etiquetas de PHP como haces en la linea #4 ya que así estás enviando datos —aunque sea un espacio o un salto de linea— al navegador antes de usar header(). Además tampoco tiene mucho sentido que lo cierres si el código que le sigue, sigue siendo PHP.