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I got a error in my project if there some please give the solution. I have post my coding with this and error.
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Notice: Undefined variable: class in C:\xampp\htdocs\cecri karikudi\Attendancereport.php on line 212



<?php
@ob_start();
session_start();
?>
<!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=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>CECRI KARAIKUDI</title>
<?php
include('css.php');
?>
</head>

<body>
<div class="row" align="center"><a href="index.php"><img src="img/header.png" class="img img-responsive" alt="" align="center" /></div><div class="clear_fix"></div><div class="row header_bot"><div class="col-sm-8"></div><div class="col-sm-4 pull-right" align="right">
	<?php if(isset($_SESSION['username'])){ ?>
    	 <span class="header_bot_span"><a href="logout.php">Logout</a></span>
    <?php } else { ?>
        <span class="header_bot_span"><a href="admin.php">Admin</a></span>
        <span class="header_bot_span"><a href="student_login.php">Student</a></span>
    <?php } ?>
 </div>
</div>

<!-- Start Content -->
	<div class="clearfix"></div>
<div class="row strip">
	class="fa fa-exchange">  <a href="index.php"><span class="strip_font">Home</span></a> / <a class="active" href=""><span class="strip_font" style="color:#C00;">Monthly Attendance Report</span></a>
</div>
<div class="clearfix"></div>


<div class="col-md-12">
<div class="col-md-3 left_side_menu">
	<?php
     include('admin_menu.php');
	 include('db.php');
	 if(isset($_SESSION['username'])){
	if(isset($_POST['submit'])){
		$class = $_POST['class'];
		$subject_name_and_subject_code = $_POST['subject_name_and_subject_code'];
        $subject_handle_by = $_POST['subject_handle_by'];
        $batch=$_POST['batch'];
        $semester=$_POST['semester'];
        $period=$_POST['period'];
		
	}
    ?>
</div>
<div class="col-md-9 col-sm-9 col-xs-12 content_border" style="margin-top:10px; padding:10px;">
<div class="row">
<div class="col-md-6 ol-sm-6 col-xs-12">
<table class="table table-bordered table-responsive">
<form name="" method="post" action="" enctype="multipart/form-data">
<?php
	$query = $db->query("select * from class") or die(mysqli_error());
?>
<tr>
	<th>Select class </th>
    <td>
    	<select name="class" class="form-control my_form">
			<?php
       			 while($row = mysqli_fetch_assoc($query)){ ?>
                <option value="<?php echo $row['class_name']; ?>"><?php echo $row['class_name']; ?></option>
   		 <?php } ?>
		</select>
    </td>
</tr>
<tr>
	<th>subject name and subject code</th>
    <td>
    	<select name="subject_name_and_subject_code" required="required" class="form-control my_form">
            <option value="">subject name and subject code</option>
            <option value="HS851-TECHNICAL ENGLISH:(4004)-(II-SEM)">HS851-TECHNICAL ENGLISH:(4004)-(II-SEM)</option>
            <option value="MA8251-ENGINEERING MATHEMATICS-II:(4004)-(II-SEM)">MA8251-ENGINEERING MATHEMATICS-II:(4004)-(II-SEM)</option>
            <option value="PH8254-PHYSICS OF MATERIALS:(3003)-(II-SEM)">PH8254-PHYSICS OF MATERIALS:(3003)-(II-SEM)</option>
            <option value="CY8292-CHEMISTRY FOR TECHNOLOGISTS:(3003)-(II-SEM)">CY8292-CHEMISTRY FOR TECHNOLOGISTS:(3003)-(II-SEM)</option>
            <option value="BE8251-BASIC ELECTRICAL AND ELECTRONICS ENGINEERING:(3003)-(II-SEM)">BE8251-BASIC ELECTRICAL AND ELECTRONICS ENGINEERING:(3003)-(II-SEM)</option>
            <option value="EL8201-PRINCIPLES OF ELECTROCHEMISTRY:(3003)-(II-SEM)">EL8201-PRINCIPLES OF ELECTROCHEMISTRY:(3003)-(II-SEM)</option>
            <option value="MA6459-NUMERICAL METHODS:(3104)-(IV-SEM)">MA6459-NUMERICAL METHODS:(3104)-(IV-SEM)</option>
            <option value="CH6455-CHEMICAL ENGINEERING THERMODYNAMICS:(3104)-(IV-SEM)">CH6455-CHEMICAL ENGINEERING THERMODYNAMICS:(3104)-(IV-SEM)</option>
            <option value="EL6401-CHEMICAL RECTION ENGINEERING:(3003)-(IV-SEM)">EL6401-CHEMICAL RECTION ENGINEERING:(3003)-(IV-SEM)</option>
            <option value="CH6460-MATERIAL TECHNOLOGY:(3003)-(IV-SEM)">CH6460-MATERIAL TECHNOLOGY:(3003)-(IV-SEM)</option>
            <option value="EL6402-HEAT TRANSFER AND ITS APPILCTION:(3003)-(IV-SEM)">EL6402-HEAT TRANSFER AND ITS APPILCTION:(3003)-(IV-SEM)</option>
            <option value="EL6403-PRINCIPLES OF ELECTROCHEMISTRY:(3003)-(IV-SEM)">EL6403-PRINCIPLES OF ELECTROCHEMISTRY:(3003)-(IV-SEM)</option>
            <option value="EL6601-ELECTROCHEMICAL MATERIALS SCIENCE:(3003)-(VI-SEM)">EL6601-ELECTROCHEMICAL MATERIALS SCIENCE:(3003)-(VI-SEM)</option>
            <option value="CH6653-MASS TRANSFER-II:(3003)">CH6653-MASS TRANSFER-II:(3003)</option>
            <option value="EL6602-INDUSTRIAL MATERIAL FINISHING:(3003)-(VI-SEM)">EL6602-INDUSTRIAL MATERIAL FINISHING:(3003)-(VI-SEM)</option>
            <option value="EL6603-INSTRUMENTATION:(3003)-(VI-SEM)">EL6603-INSTRUMENTATION:(3003)-(VI-SEM)</option>
            <option value="EL6604-ELECTROCHEMICAL PROCESS TECHNOLOGY:(3003)-(VI-SEM)">EL6604-ELECTROCHEMICAL PROCESS TECHNOLOGY:(3003)-(VI-SEM)</option>
            <option value="EL6605-PROCESS DYNAMICS AND CONTROL:(3104)-(VI-SEM)">EL6605-PROCESS DYNAMICS AND CONTROL:(3104)-(VI-SEM)</option>
            <option value="EL6801-ELECTROCHEMICAL ENERGY CONVERSION & STORAGE:(3003)-(VIII-SEM)">EL6801-ELECTROCHEMICAL ENERGY CONVERSION & STORAGE:(3003)-(VIII-SEM)</option>
            <option value="EL6802 SURFACE SCIENCE:(3003)-(VIII-SEM)">EL6802 SURFACE SCIENCE:(3003)-(VIII-SEM)</option>
            <option value="ELECTIVE-II EL6005 CATHODIC PROTECTION & ELECTROPHRETIC COATINGS-(VIII-SEM)">ELECTIVE-II EL6005 CATHODIC PROTECTION & ELECTROPHRETIC COATINGS-(VIII-SEM)</option>

            
        </select>
    </td>
</tr>
<tr>
	<th>Subject handle by</th>
    <td>
    	<select name="Subject_handle_by" required="required" class="form-control my_form">
            <option value="">subject handle by</option>
            <option value="Mr.THOMAS ALEXANDER,M.A.M.Phil(TECHNICAL ENGLISH)">Mr.THOMAS ALEXANDER,M.A.M.Phil(TECHNICAL ENGLISH)</option>
            <option value="Mr.S.SIVAKUMAR,M.Sc,M.Phil,P.G.D.C.A(ENGINEERING MATHS-II">Mr.S.SIVAKUMAR,M.Sc,M.Phil,P.G.D.C.A(ENGINEERING MATHS-II</option>
            <option value="Mr.D.SHERWOOD,M.Sc,P.G.D.C.A(ENGINEERING MATHS-II)">Mr.D.SHERWOOD,M.Sc,P.G.D.C.A(ENGINEERING MATHS-II)</option>
            <option value="Dr.V.SARANYAN,M.Sc,Ph.D(PHYSICS OF MATERIALS)">Dr.V.SARANYAN,M.Sc,Ph.D(PHYSICS OF MATERIALS)</option>
<option value="Dr.M.RAMESH,M.Sc,Ph.D(PHYSICS OF MATERIALS">Dr.M.RAMESH,M.Sc,Ph.D(PHYSICS OF MATERIALS</option>
<option value="Dr.A.SUBBIAH,M.Sc,Ph.D(CHEMISTRY FOR TECHNOLOGISTS)">Dr.A.SUBBIAH,M.Sc,Ph.D(CHEMISTRY FOR TECHNOLOGISTS)</option>
<option value="Dr.M.KATHIRESAN,M.Sc,Ph.D(CHEMISTRY FOR TECHNOLOGISTS)">Dr.M.KATHIRESAN,M.Sc,Ph.D(CHEMISTRY FOR TECHNOLOGISTS)</option>
<option value="Mr.P.THIPPERUDRASAMY.PGD(emb.sys).M.Tech(BASIC ELECTRICAL AND ELECTRONICS ENGINEERING)">Mr.P.THIPPERUDRASAMY.PGD(emb.sys).M.Tech(BASIC ELECTRICAL AND ELECTRONICS ENGINEERING)</option>
<option value="Er.V.GOPALAKRISHAN,B.E(BASICS ELECTRICAL AND ELECTRONICS ENGINEERING)">Er.V.GOPALAKRISHAN,B.E(BASICS ELECTRICAL AND ELECTRONICS ENGINEERING)</option>
<option value="Dr.J.MATHIYARASU,M.Sc,Ph.D(PRINCIPLES OF ELECTROCHEMISTRY)">Dr.J.MATHIYARASU,M.Sc,Ph.D(PRINCIPLES OF ELECTROCHEMISTRY)</option>
<option value="Dr.JAMES JOSEPH,M.Sc,Ph.D(PRINCIPLES OF ELECTROCHEMISTRY">Dr.JAMES JOSEPH,M.Sc,Ph.D(PRINCIPLES OF ELECTROCHEMISTRY</option>
<option value="Mr.S.SIVAKUMAR,M.Sc,M.Phil,P.G.D.C.A(NUMERICAL METHODS)">Mr.S.SIVAKUMAR,M.Sc,M.Phil,P.G.D.C.A(NUMERICAL METHODS)</option>
<option value="Mr.D.SHERWOORD,M.Sc,P.G.D.C.A(NUMERICAL METHODS)">Mr.D.SHERWOORD,M.Sc,P.G.D.C.A(NUMERICAL METHODS)</option>
<option value="Dr.R.MALINI,M.Tech,Ph.D(CHEMICAL ENGINEERING THERMODYNAMICS)">Dr.R.MALINI,M.Tech,Ph.D(CHEMICAL ENGINEERING THERMODYNAMICS)</option>
<option value="Dr.V.RAVI BABU,M.Tech,Ph.D(CHEMICAL REACTION ENGINEERING)">Dr.V.RAVI BABU,M.Tech,Ph.D(CHEMICAL REACTION ENGINEERING)</option>
<option value="Dr.L.JHON BERCHMANS,M.Tech,Ph.D(MATERIALS TECHNOLOGY)">Dr.L.JHON BERCHMANS,M.Tech,Ph.D(MATERIALS TECHNOLOGY)</option>
<option value="Dr.M.SATHISH,M.Sc,Ph.D(MATERIALS TECHNOLOGY)">Dr.M.SATHISH,M.Sc,Ph.D(MATERIALS TECHNOLOGY)</option>
<option value="Dr.G.SREEDHAR,M.Tech,Ph.D(HEAT TRANSFER AND ITS APPLICATIONS)">Dr.G.SREEDHAR,M.Tech,Ph.D(HEAT TRANSFER AND ITS APPLICATIONS)</option>
<option value="Dr.J.MATHIYARASU,M.Sc,PH.D(PRINICIPLES OF ELECTROCHEMISTRY)">Dr.J.MATHIYARASU,M.Sc,PH.D(PRINICIPLES OF ELECTROCHEMISTRY)</option>
<option value="Dr.JAMES JOSEPH,M.Sc,Ph.D(PRINICIPLES OF ELECTROCHEMISTRY)">Dr.JAMES JOSEPH,M.Sc,Ph.D(PRINICIPLES OF ELECTROCHEMISTRY)</option>
<option value="Dr.B.SUBRAMANIAN,M.Sc,Ph.D(ELECTROCHEMICAL MATERIALS SCIENCE)">Dr.B.SUBRAMANIAN,M.Sc,Ph.D(ELECTROCHEMICAL MATERIALS SCIENCE)</option>
<option value="Dr.N.LAKSHMINARASIMHAN,M.Sc,Ph.D(ELECTROCHEMICAL MATERIALS SCIENCE)">Dr.N.LAKSHMINARASIMHAN,M.Sc,Ph.D(ELECTROCHEMICAL MATERIALS SCIENCE)</option>
<option value="Dr.KARTHIK,M.Sc,Ph.D(ELECTROCHEMICAL MATERIALS SCIENCE)">r.KARTHIK,M.Sc,Ph.D(ELECTROCHEMICAL MATERIALS SCIENCE)</option>
<option value="Dr.V.MURUGAN,B.Phram,M.S,Ph.D(ELECTROCHEMICAL MATERIALS SCIENCE)">Dr.V.MURUGAN,B.Phram,M.S,Ph.D(ELECTROCHEMICAL MATERIALS SCIENCE)</option>
<option value="Dr.SUNDAR MAYAVAN,B.Tech,M.S.Ph.D(MASS TRANSFER)">Dr.SUNDAR MAYAVAN,B.Tech,M.S.Ph.D(MASS TRANSFER)</option>
<option value="Dr.R.SEKAR,M.Sc,M.Phil,Ph.D(INDUSTRIAL METAL FINISHING)">Dr.R.SEKAR,M.Sc,M.Phil,Ph.D(INDUSTRIAL METAL FINISHING)</option>
<option value="Dr.M.JAYAKUMAR,M.Sc,M.Phil,Ph.D(INDUSTRIAL METAL FINISHING)">Dr.M.JAYAKUMAR,M.Sc,M.Phil,Ph.D(INDUSTRIAL METAL FINISHING)</option>
<option value="Dr.N.RAJASHAKARANM.Sc,Ph.D(INDUSTRIAL METAL FINISHING)">Dr.N.RAJASHAKARANM.Sc,Ph.D(INDUSTRIAL METAL FINISHING)</option>
<option value="Dr.S.RADHAKRISHAN,M.Sc,Ph.D(INSTRUMENTATION)">Dr.S.RADHAKRISHAN,M.Sc,Ph.D(INSTRUMENTATION)</option>
<option value="Dr.G.SOZHAN,M.E,Ph.D(ELECTROCHEMICAL PROCESS TECHNOLOGY)">Dr.G.SOZHAN,M.E,Ph.D(ELECTROCHEMICAL PROCESS TECHNOLOGY)</option>
<option value="Dr.T.VIJAYABHARATHI,M.Sc,Ph.D(ELECTROCHEMICAL PROCESS TECHNOLOGY)">Dr.T.VIJAYABHARATHI,M.Sc,Ph.D(ELECTROCHEMICAL PROCESS TECHNOLOGY)</option>
<option value="Dr.V.SURIYANARAYANAN,M.Sc,Ph.D(ELECTROCHEMICAL PROCESS TECHNOLOGY)">Dr.V.SURIYANARAYANAN,M.Sc,Ph.D(ELECTROCHEMICAL PROCESS TECHNOLOGY)</option>
<option value="Dr.S.VENGATESAN,M.Sc,M.Tech,Ph.D(ELECTROCHEMICAL PROCESS TECHNOLOGY)">Dr.S.VENGATESAN,M.Sc,M.Tech,Ph.D(ELECTROCHEMICAL PROCESS TECHNOLOGY)</option>
<option value="Dr.R.MAYANDI,BTech,Ph.D(PROCESS DYNAMICS AND CONTROL)">Dr.R.MAYANDI,BTech,Ph.D(PROCESS DYNAMICS AND CONTROL)</option>
<option value="Dr.M.V.T.DHANAJEYAN,M.Sc,Ph.D(ELECTROCHEMICAL ENGERY CONVERSION &STORAGE)">Dr.M.V.T.DHANAJEYAN,M.Sc,Ph.D(ELECTROCHEMICAL ENGERY CONVERSION &STORAGE)</option>
<option value="Dr.M.RAJU,M.E,Ph.D(ELECTROCHEMICAL ENGERY CONVERSION &STORAGE)">Dr.M.RAJU,M.E,Ph.D(ELECTROCHEMICAL ENGERY CONVERSION &STORAGE)</option>
<option value="Dr.V.SARANYAN,M.Sc,Ph.D(SURFACE SCIENCE)">Dr.V.SARANYAN,M.Sc,Ph.D(SURFACE SCIENCE)">Dr.V.SARANYAN,M.Sc,Ph.D(SURFACE SCIENCE)">Dr.V.SARANYAN,M.Sc,Ph.D(SURFACE SCIENCE)</option>
<option value="Dr.K.SELVAKUMAR,M.Sc,Ph.D(SURFACE SCIENCE)">Dr.K.SELVAKUMAR,M.Sc,Ph.D(SURFACE SCIENCE)'>Dr.K.SELVAKUMAR,M.Sc,Ph.D(SURFACE SCIENCE)">Dr.K.SELVAKUMAR,M.Sc,Ph.D(SURFACE SCIENCE)</option>
<option value="Dr.V.MURUGAN,B.Phram,M.S.Ph.D(SURFACE SCIENCE)">Dr.V.MURUGAN,B.Phram,M.S.Ph.D(SURFACE SCIENCE)">Dr.V.MURUGAN,B.Phram,M.S.Ph.D(SURFACE SCIENCE)">Dr.V.MURUGAN,B.Phram,M.S.Ph.D(SURFACE SCIENCE)</option>
<option value="Dr.A.SUBBIAH,M.Sc,Ph.D(SURFACE SCIENCE)">Dr.A.SUBBIAH,M.Sc,Ph.D(SURFACE SCIENCE)">Dr.A.SUBBIAH,M.Sc,Ph.D(SURFACE SCIENCE)">Dr.A.SUBBIAH,M.Sc,Ph.D(SURFACE SCIENCE)</option>
<option value="Dr.S.MARUTHAMUTHU,M.Sc,M.Phil,Ph.D(ELECTIVE-II CATHODIC PROTECTION & ELECTROPHRETIC COATINGS)">Dr.S.MARUTHAMUTHU,M.Sc,M.Phil,Ph.D(ELECTIVE-II CATHODIC PROTECTION & ELECTROPHRETIC COATINGS)</option>
<option value="DR.SUNDAR MAYAVAN,B.Tech,M.S,Ph.D(ELECTIVE-II CATHODIC PROTECTION & ELECTROPHRETIC COATINGS)">DR.SUNDAR MAYAVAN,B.Tech,M.S,Ph.D(ELECTIVE-II CATHODIC PROTECTION & ELECTROPHRETIC COATINGS)</option>
<option value="Dr.S.P.MANOHARAN,M.Sc,Ph.D(ELECTIVE-II CATHODIC PROTECTION & ELECTROPHRETIC COATINGS)">Dr.S.P.MANOHARAN,M.Sc,Ph.D(ELECTIVE-II CATHODIC PROTECTION & ELECTROPHRETIC COATINGS)</option>
<option value="Dr.S.SREEJAKUMARI,M.Sc,M.Tech,Ph.D(ELECTIVE-II CATHODIC PROTECTION & ELECTROPHRETIC COATINGS)">Dr.S.SREEJAKUMARI,M.Sc,M.Tech,Ph.D(ELECTIVE-II CATHODIC PROTECTION & ELECTROPHRETIC COATINGS)</option>


        

        </select>
    </td>
</tr>

<tr>
<th>Batch</th>
    <td>
    	<select name="batch" required="required" class="form-control my_form">
            <option value="">batch</option>
            <option value="2016">2016</option>
            <option value="2017">2017</option>
            <option value="2018">2018</option>
            <option value="2019">2019</option>
            <option value="2020">2020</option>
        </select>
    </td>
</tr>
<tr>
	<th>semester</th>
    <td>
    	<select name="semester" required="required" class="form-control my_form">
            <option value="">semester</option>
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
            <option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
        </select>
    </td>
</tr>
<tr>
	<th>period</th>
    <td>
    	<select name="period" required="required" class="form-control my_form">
            <option value="">period</option>
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
            <option value="4">4</option>
    <option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
        </select>
    </td>
</tr>
<tr>
	<td colspan=2><center>            <input type="submit" value="submit" class="my_btn" name="submit" /></center></td>
</tr></form>
</table>
</div><div class="col-md-6 ol-sm-6 col-xs-12"></div>
</div>
<h3 style="font-weight:bold; text-transform:uppercase; padding-bottom:5px;"> Monthly Attendance Report </h3>
<?php
    $query = $db->query("select * from stu_atten where class='$class' and subject_name_and_subject_code='$subject_name_and_subject_code' and subject_handle_by='$subject_handle_by' and batch='$batch' and semester='$semester',period='$period'") 
    or die(mysqli_error($connection));
?>
<table class="table table-bordered table-responsive">
	<tr>
        <th>S.No.</th>
        <th>Student Roll No.</th>
        <th>Student Name</th>
        <th>Class</th>
        <th>subject name and subject code</th>
        <th>subject handle by</th>
	    <th>batch</th>
	    <th>semester</th>
	    <th>period</th>
        <th>No. Of Days Present</th>
        <th>No. Of Working Days</th>
    </tr>
    <?php
	while($row = mysqli_fetch_assoc($query)){  
		$roll = $row['roll_no'];
		$stream = $row['class'];
		$querys = $db->query("select * from student_details where regno='$roll' and class='$stream'") or die(mysqli_error());
		$rows = mysqli_fetch_assoc($querys);
		$mob = $rows['parent_mob']; //echo $mob;
		//SMS Code Starts Here
		$ch = curl_init();
		$user="vinay.takeoff@gmail.com:Vinay99@";
		$receipientno= $mob; 
		$senderID="TAKEOF"; 
		$msgtxt= "Dear Parent, Your Son/Daughter ".$row['name']." has attended ".$row['present_days']." days out of ".$row['work_days']." days for the month of ".$row['month']." in the year ".$row['year']; 
		curl_setopt($ch,CURLOPT_URL,  "http://api.mVaayoo.com/mvaayooapi/MessageCompose");
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_POST, 1);
		curl_setopt($ch, CURLOPT_POSTFIELDS, "user=$user&senderID=$senderID&receipientno=$receipientno&msgtxt=$msgtxt&state=0");
		$buffer = curl_exec($ch);
		//SMS Code Ends Here
	?>
    <tr>
    	<td><center><?php echo $row['id']; ?></center></td>	
        <td><center><?php echo $row['roll_no']; ?></center></td>
        <td><center><?php echo $row['name']; ?></center></td>
        <td><center><?php echo $row['class']; ?></center></td>
        <td><center><?php echo $row['subject_name_and_subject_code']; ?></center></td>
        <td><center><?php echo $row['subject_handle_by']; ?></center></td>
	    <td><center><?php echo $row['batch'];?></center></td>
	    <td><center><?php echo $row['semester'];?></center></td>
	    <td><center><?php echo $row['period'];?></center></td>
        <td><center><?php echo $row['present_days']; ?></center></td>
        <td><center><?php echo $row['work_days']; ?></center></td>
    </tr>
    <?php } ?>
</table>

</div>
</div>


<!-- End Content -->

<?php
include('footer.php');
} else{		
	header('location:index.php?suc=suc');	
}
?>
</body>
</html>

What I have tried:

db.php


<pre><?php
error_reporting();
$db = new mysqli('localhost', 'root', '', 'cecri karaikudi');
if($db->connect_errno){
	die('Sorry Database not connected !!!');
}
?>
Posted
Updated 25-Feb-20 9:05am
Add a Solution
Comments
F-ES Sitecore 25-Feb-20 6:38am    
And line 212 is....?

3 solutions

Look, come on.
I've told you this before - today: I got a error in my project if there some please give the solution. I have post my coding with this and error.[^] - you need to start solving your own syntax errors. If nothing else, we will not be available when you take your exams - so if you have no idea how to fix trivial problems like this yourself, you aren't going to be able to hand in anything.

So again: Look at the error message; Look at the location (which gives you the file name and the line within the file at which the problem occured); think about what it says. The message is pretty explicit!

It doesn't take a lot to think about this and solve it yourself, and the more you do that, the quicker the whole process becomes. Asking us for every trivial problem is a very slow way to do it, and gets you a reputation as a Help Vampire ...
 
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Posted
Very small children keep asking for the same thing over-and-over in the hopes that enough such nagging will get them what they want.

It is time you changed your strategy for getting help with problems.

Nagging shouldn't work for children - it won't work with us.
 
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Posted
Quote:
Notice: Undefined variable: class in C:\xampp\htdocs\cecri karikudi\Attendancereport.php on line 212

The error message gives you a lot of informations: 'Undefined variable: class' and 'on line 212'
For some reason, the variable is not defined, you need to track in your code to see there the variable should be defined and what can prevent from being defined.
Advice: learn the debugger.

Your code do not behave the way you expect, or you don't understand why !

There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your code is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]

phpdbg | php debugger[^]
Debugging techniques for PHP programmers[^]

The debugger is here to only show you what your code is doing and your task is to compare with what it should do.
 
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Posted
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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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