help me on this error

i have two textbox and i check if the user insert this username and this password then go to another page else write wrong data and it is the code

<?php
$name="test";
$password="test";
if($_POST["admin_name"]==$name and $_POST["pass"]==$password)
{ header("location: /form/index.php");}
else
{echo"wrong data";}
?>

but this code give me this error
Warning: Cannot modify header information - headers already sent

i donot know what i do
please i want help


thank you

 

If you are using header(), you have to make sure that there is no other output being generated before you call it.

A common cause of this problem is blank lines in your file before the first <?

It's also possible that you've saved your PHP file as unicode with BOM (byte-order mark).

 

i have a table on the page before the code and i save the php file ANSI not unicode
what will i do????

 

You can't have any output before the header() call.

Also, it doesn't make any sense to generate output if you are going to be sending a redirect header, since the browser will not display it.

But if it's too much work to reorganise your code, you can just cheat, and use output buffering.

<?

ob_start();

// output the table

if (whatever_condition)
{
   ob_end_clean();
   header("Location: elsewhere");
   exit;
}

ob_end_flush();

// do something else

?>

PHP:

 

header() always() use before rendering any output.

so u can use javascript for this

<?php
$name="test";
$password="test";
if($_POST["admin_name"]==$name and $_POST["pass"]==$password)
{ echo "<script language='javascript'>window.location='/form/index.php'</script>";}
else
{echo"wrong data";}
?>

OK

 

yes it work good thank you very much

 

Don't use Javascript, because the user can disable it and then your script wouldn't redirect anymore.