[SOLVED] problem with "headers already sent" errors

flunn · May 24, 2007

I am learning php because I want to make interactive quizzes etc for my educational website. I have been using Larry Ullman's book "PHP for the World Wide Web."

I've written some code -- based on code I've found in LU's book. The code uses "sessions_start()". When I test it on my local server it works fine, but when I upload it to my shared server I get "headers already sent" error messages.

These can be seen at

http://adrawingblog.net/new_banner.php

LU discusses "ob_start()" briefly in Chapter 8 and explains how using it helps to avoid "headers already sent" messages. I hadn't included this function in the code however, because as long as I was working locally, it wasn't necessary. When I uploaded it and saw the errors, I inserted "ob_start()" and uploaded again but it didn't help. (Following LU's instructions, I also inserted "ob_end_flush()".)

I experimented with putting the "ob_start()" call in various places and putting it before and after the "sessions_start()" call, but this didn't help either. (As far as I can see, LU discusses output buffering only once in his book, before he discusses "sessions." He says that the "ob_start()" call should come at the "very top of the page" but that's all.)

Any help solving this problem would be much appreciated.

regards to all

from flunn

Here is the code


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 TRANSITIONAL//EN">
<?php
session_start();
ob_start();
?>


<html>

<head>


	<title>Verb Tense Quiz</title>

	<style media="screen" type="text/css">
	.text {
		color:black;
		font-size: 12px;
		font-family: Arial;
		margin-top: 0px;

		}

	.text14 {
		color:black;
		font-size: 14px;
		font-family: Arial;
		margin-top: 0px;
		}

	.text14_marg {
		color:black;
		font-size: 14px;
		font-family: Arial;
		margin-top: 50px;
		line-height: 225%;
		margin-left: 10%;
		margin-right: 10%;
		border: 1px solid black;
		}


	.bnr_box {
		position: absolute;
		top:0px;
		left: 72px;
		width: 624px;
		height: 82px;
		border: 1px solid black;
		padding: 2px;
		}

	.bnr_links1 {
		position: absolute; 
		top: 0px; 
		right: 0px; 
		width: 472px; 
		height: 25px;
		text-align: right; 
		border: 1px solid black; 
		background: white
		}

	.main_box {
		position: absolute;
		left: 72px;
		top: 90px;
		width: 624px;
		height: 800px;
		border: 1px solid black;
		padding: 2px;
		}

	</style>
</head>
<body>
	<div class="bnr_box">
		<p class="text"> Interactive Grammar <br />
			Verb Tense Quiz</p>
		<div class="bnr_links1">
			<p class="text"> general links</p>
		</div>
	</div>

	<div class="main_box">

<?php //flesl_script 1.0 basic_quiz.php

//Address error handling
ini_set('display_errors', 1);
error_reporting(E_ALL & ~E_NOTICE);

if (empty ($_SESSION['total_right'])) {
$_SESSION['total_right']= 0;
}

//Check to see if the form has been submitted
if (isset($_POST['submit'])) { //if the submit button has been clicked
if (empty($_POST['answer'])) { //if the question has not been answered
		$response = "You have not answered the question yet.";

} else {
	if ($_POST['answer'] == "swims") {
		$response = "Right";
			$_SESSION['total_right'] = $_SESSION['total_right'] +1;
			$_SESSION['total_done'] = $_SESSION['total_done'] + 1;


	} else {
		$response = "Wrong";
		$_SESSION['total_done'] = $_SESSION['total_done'] + 1;

	}
} 
}//End of checking IF




//display option #1: question not answered so full form displayed again
if (!isset($_POST['submit']) || (empty($_POST['answer'])))  {
print '<p class="text14">Type the correct form of the verb "swugs" in the box.</p>';
print  '<form action="new_banner.php" method="post">';
print  '<p class="text14_marg">Harry can\'t play tennis anymore because he has a bad back but he still <input type="text" name="answer" size="20" value="' .$_POST['answer']. '"/> in his pool three times a week.</p><br />'; 
print '<input type="submit" name="submit" value="Submit your Answer"/> ';
print '</form>';
print $response;
} else { 


// display option #2: question answered

//display option #2a: test not finished
if ($_SESSION['total_done']<=2) {
	print '<p>Type the correct form of the verb "swim" in the box.</p>';
	print  '<form action="basic_quiz(2).php" method="post">';
	print  'Harry can\'t play tennis anymore because he has a bad back but he still <input type="text" name="answer" size="20" value="' .$_POST['answer']. '"/		> in his pool three times a week.<br />'; 
	print '</form> <br />';
	print $response;
	print '<br />';
	print "<p>Your score so far is {$_SESSION['total_done']} answered and {$_SESSION['total_right']} right.</p>";
	print '<br />';
	print '<a href="new_banner.php"><button>Go to Next Question</button></a> '		;
	}
//display option #2b: test finished
else {
print  '<form action="basic_quiz(2).php" method="post">';
	print  'Harry cannot play tennis anymore because he has a bad back but he still <input type="text" name="answer" size="20" value="' .$_POST['answer']. '"/> three times a week.<br />'; 
	print '</form> <br />';
	print $response;
	print '<br />';
print "<p>You have finished Verb Tense Test #3</p> Your final score is {$_SESSION	['total_right']} out of 10 <br />" ;
	unset($_SESSION);
	session_destroy();
print '<a href="new_banner.php"><button>Do The Test Again</button></a> ';
	  }
}

print '<br />';
;
?>

	</div>
</body>
</html>
<?php
ob_end_flush();
?>

MadTechie · May 24, 2007

the problem is here


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 TRANSITIONAL//EN">
<?php
session_start();
ob_start();
?>

read the pinned topic for more info..(as you should of before posting)

easy to resolve, but i have explained this so many times now.. yet people don't search the forum!

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[SOLVED] problem with "headers already sent" errors

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