Fatal error: Cannot redeclare head()

Client Joined: Oct 07, 2003 Posts: 735 Location: Ohio

I have been round and round on this and cannot find my error. I think it has to do with my authentication. Let me explain.

I have a Peer Evaluation page for 1st and 2nd year medical students. First they authenticate with LDAP.

Code:

function AuthStudent() {





etc 


etc


if  ($db->sql_numrows($sql) == 1) {


           // if a row was returned


              // authentication was successful


           // set session variable         


         $_SESSION['authuser'] = $authuser;


header("Location: modules.php?name=$module_name&op=nav");   


}


}

nav is a function like so.

Code:

function nav() {


 global $prefix, $module_name, $db;


 include("header.php");       


    echo "<table border=\"1\" width=\"100%\" align=\"center\"><tr><td width=\"10%\">";       


    echo "<font class=\"content\">"


   ."<center><a href=\"modules.php?name=$module_name&amp;op=TLM1StudentGrades\"><img src='modules/$module_name/images/M1icon.gif'\" border=\"0\" alt=\"Current Team Learning Grades\" title=\"First Year Courses\"></a><br>"


   ."<a href=\"modules.php?name=$module_name&amp;op=TLM1StudentGrades\">First Year Courses</a>"


   ."</center></font></td>";


   


   


    echo "<td width=\"10%\"><font class=\"content\">"


   ."<center><a href=\"modules.php?name=$module_name&amp;op=TLM2StudentGrades\"><img src='modules/$module_name/images/courses.jpg'\" border=\"0\" alt=\"Peer Evaluations\" title=\"Second Year Courses\"></a><br>"


   ."<a href=\"modules.php?name=$module_name&amp;op=TLM2StudentGrades\">Second Year Courses</a>"


   ."</center></font></td>";     


  


   


   echo "<td width=\"10%\"><font class=\"content\">"


       ."<center><a href=\"modules.php?name=$module_name&amp;op=PeerEval\"><img src='modules/$module_name/images/test-icon.jpg'\" border=\"0\" alt=\"Submit Peer Evaluations\" title=\"Submit Peer Evaluations\"></a><br>"


       ."<a href=\"modules.php?name=$module_name&amp;op=PeerEval\">Submit Peer Evaluations</a>"


       ."</center></font></td>"; 


    


    echo "</tr></table>"; 


}

They can view scores from first or second year courses. They also click on "Submit Peer Evaluations" and it sends them to the proper page depending on which Class_Year they are in.

First year students complete peer eval after each course, while second year med students complete evals after each term.

Here is the Peer Eval function

Code:

function PeerEval() {


global $module_name, $prefix, $db, $authuser;


   if (!$authuser) {


      header("Location: modules.php?name=$module_name&op=DisplayLogin");


      exit;


   }


   nav();


      //What class year does the student belong?


   $getYear = $db->sql_query("SELECT * FROM ".$prefix."_tl_students WHERE LDAP_USER = '$authuser'");


   if (!$getYear) {


      echo("<p>Error performing query: " . mysql_error() . "</p>");


      exit();


   }


   $row = $db->sql_fetchrow($getYear);   


   $LDAP_USER = $row['LDAP_USER'];


   $Class_Year = $row['Class_Year'];





   if ($Class_Year == 1) {   


//Class year found now get Course Number.   


$getCourse = $db->sql_fetchrow($db->sql_query("SELECT Course_Number, PE_Enabled FROM ".$prefix."_tl_courses 


WHERE ((Peer_Eval = 'Yes') && (PE_Enabled = 'Yes'))"));   


$Course_Number = $getCourse['Course_Number'];


$PE_Enabled = $getCourse['PE_Enabled'];


//Find the start and stop time for Peer Evaluations      


$coursedata = TLCourse_info($Course_Number);


$today = time();


$start = strtotime($coursedata['PE_start_time']);


$stop = strtotime($coursedata['PE_stop_time']);





if (($PE_Enabled == 'Yes') && ($today >= $start) && ($today <= $stop)){ 


TLAddM1PeerEvals($Course_Number);


 }else{


 OpenTable();


   echo "<br>\n"


      ."<form action='modules.php?name=$module_name' method='post'>"


      ."<table border=\"0\">"


          ."<tr><td>Team learning peer evaluations are not enabled or the time to complete an evaluation has expired.</td></tr>"


      ."<tr><td>If you are a first year medical student please email xxx at xxx.xxxx@wright.edu, or call her at xxx -xxxx.</td></tr>"


      ."<tr><td>If you are a second year medical student please email xxxxx  at xxx.xxxx@wright.edu, or call her at xxx-xxxx.</td></tr>"      


      ."<tr><td><input type=\"hidden\" name=\"op\" value=\"nav\">\n"


      ."<input type=\"submit\" value=\"Continue\"></form></td></tr></table><br>\n\n";


CloseTable();


   exit();   


}


}





if ($Class_Year == 2) {   


//Get Term      


$getTerm = $db->sql_fetchrow($db->sql_query("SELECT term, enabled, PE_start_time, PE_stop_time FROM ".$prefix."_tl_M2settings"));


$Term = $getTerm['term'];


$Term_Enabled = $getTerm['enabled'];


$start_time = $getTerm['PE_start_time'];


$stop_time = $getTerm['PE_stop_time'];


}


$today = time();


$start = strtotime($start_time);


$stop = strtotime($stop_time);


if (($Term_Enabled == '1') && ($today >= $start) && ($today <= $stop)){ 


TLM2PeerEvals($Term);


 }else{


 OpenTable();


   echo "<br>\n"


      ."<form action='modules.php?name=$module_name' method='post'>"


      ."<table border=\"0\">"


          ."<tr><td>Team learning peer evaluations are not enabled or the time to complete an evaluation has expired.</td></tr>"


         ."<tr><td>Please email xxxx  at xxx@wright.edu, or call her at xxx-xxxx.</td></tr>"      


      ."<tr><td><input type=\"hidden\" name=\"op\" value=\"nav\">\n"


      ."<input type=\"submit\" value=\"Continue\"></form></td></tr></table><br>\n\n";


CloseTable();


   exit();


   }


   


   }

If it is a first year student I pass the $Course_Number and send them to TLAddM1PeerEvals.

If it is a second year student I pass $Term and send them to TLM2PeerEvals.

My case statement has this.

Code:

switch($op) {





case "AuthStudent":


   AuthStudent();


   break;





case "PeerEval":


   PeerEval($authuser);


   break;





case "TLAddM1PeerEvals":


   TLAddM1PeerEvals($Course_Number);


   break;





case "TLM2PeerEvals":


   TLM2PeerEvals($Term);


   break;





case "DisplayLogin":


   DisplayLogin();


   break;


   


case "nav":


   nav();


   break;


   


case "Logout":


   Logout();


   break;


   


}

My page starts with this.

Code:




require_once("mainfile.php");


$module_name = basename(dirname(__FILE__));


get_lang($module_name);





##################################################


# Start the session                              #


##################################################


session_start();


if (isset($_SESSION['authuser'])) {


   $authuser = $_SESSION['authuser'];


} else {


   $authuser = '';


}

Each time I try to enter Peer Eval as either a first or second year student I get the following:

Quote:

Fatal error: Cannot redeclare head() (previously declared in /Library/WebServer/Documents/atlas/header.php:2 Cool

in /Library/WebServer/Documents/atlas/header.php on line 47

I cannot find where I am including the header twice.

I think my authuser variable is getting stepped on and this is causing the Fatal error:.

Code:

if (!$authuser) {


   header("Location: modules.php?name=$module_name&op=DisplayLogin");


      exit;


   }

Site Admin/Owner Joined: Aug 27, 2002 Posts: 17088

Move session_start(); to the start of your script.