Why the given value become 0 while saving the value in database

Question

1.00/5 (1 vote)

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<?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>
<div class="clear_fix"></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;">Add Daily Attendance</span></a>
</div>
<div class="clearfix"></div>


<div class="col-md-12">
<div class="col-md-3 left_side_menu">
	<?php
    error_reporting(0);
	 include('db.php');
     include('admin_menu.php');
	 if(isset($_SESSION['username'])){
	if(isset($_POST['submit'])){
		//print_r($_POST);die;
		$roll = $_POST['roll_no'];
		$name = $_POST['name'];
		$class = $_POST['class'];
		$date = $_POST['date'];
		$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'];
        $present = $_POST['atten'];
        // echo "INSERT INTO daily_atten(id, roll_no, class, date, subject_name_and_subject_code, subject_handle_by, batch, semester, period1, present) VALUES ('$roll_no','$class','$date','$subject_name_and_subject_code','$subject_handle_by','$batch','$semester','$period','$present')");
        $sql = $db->query("INSERT INTO `daily_atten`(`id`, `roll_no`, `class`, `date`, `subject_name_and_subject_code`, `subject_handle_by`, `batch`, `semester`, `period1`, `present`) VALUES ('$id','$roll_no','$class','$date','$subject_name_and_subject_code','$subject_handle_by','$batch','$semester','$period1','$present')");
		if($sql){
			echo "<script>alert('Details Saved Successfully');</script>";
		}else{
			echo "<script>alert('Failed to Save the details. Please Check');</script>";	
		}
    }
    // die();
    ?>
</div>
<div class="col-md-9 col-sm-9 col-xs-12 content_border" style="margin-top:10px; padding:10px;">
<h3 style="font-weight:bold; text-transform:uppercase; padding-bottom:5px;"> Add Student Attendance (Daily)</h3>
<div class="row">
<div class="col-md-6 ol-sm-6 col-xs-12">
<table class="table table-bordered table-responsive">
<?php
	$query = $db->query("select * from class") or die(mysqli_error());
?>
<form method="post" action="" enctype="multipart/form-data">
<tr>
	<th>Student Roll No.</th>
    <td><input type="text" name="roll_no"  placeholder="roll_no"  class="form-control my_form" required="required" /></td>
</tr>
<tr>
	<th>Student Name</th>
    <td><input type="text" name="name"  placeholder="Student Name" class="form-control my_form" required=" required" /></td>
</tr>
<tr>
	<th>Class</th>
    <td><select name="class" class="form-control my_form">
	<?php
        while($row = mysqli_fetch_assoc($query)){ ?>
                <option value="<?php echo $row['class_name']; ?>"><?php echo $row['class_name']; ?></option>
    <?php } ?>
		</select>
    </td>
</tr>
<tr>
	<th>Date</th>
    <td><input type="date" name="date" class="form-control my_form" placeholder="mm/dd/yyyy" required /></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" 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>
	<th>Present</th>
    <td>
    	<select name="atten" class="form-control my_form">
        	<option value="Yes">Yes</option>
            <option value="No">No</option>
        </select>
    </td>
</tr>
<tr>
	<td colspan=2><center>          <input type="submit" value="submit" name="submit" class="my_btn" /></center></td>
</tr>
</table>
	  </form>
    	</div>
    	<div class="col-md-6 ol-sm-6 col-xs-12"></div>
    </div>
   </div>
</div>


<!-- End Content -->

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

What I have tried:

the db.php

<?php
error_reporting();
$db = new mysqli('localhost', 'root', '', 'cecri karaikudi');
if($db->connect_errno){
	die('Sorry Database not connected !!!');
}
?>

Posted 8-Mar-20 17:13pm

nehaperiyasamy

Updated 8-Mar-20 20:40pm

Add a Solution

Comments

Stefan_Lang 9-Mar-20 9:06am

Copying a wall of code is lazy. If you, who knows the code best, can't be bothered to spend a very moderate amount of time to pin down the relevant lines that are causing this issue, then don't expect that anyone else is going to spend a considerably larger amount of time to dig through your code in search for a rather vaguely specified problem!

1 solution

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Patrice T · Answer 1 · 2020-03-08T20:41:00

Quote:
Why the given value become 0 while saving the value in database

Which value ?

PHP

$sql = $db->query("INSERT INTO `daily_atten`(`id`, `roll_no`, `class`, `date`, `subject_name_and_subject_code`, `subject_handle_by`, `batch`, `semester`, `period1`, `present`) VALUES ('$id','$roll_no','$class','$date','$subject_name_and_subject_code','$subject_handle_by','$batch','$semester','$period1','$present')");

Not necessary a solution to your question, but another problem you have.
Never build an SQL query by concatenating strings. Sooner or later, you will do it with user inputs, and this opens door to a vulnerability named "SQL injection", it is dangerous for your database and error prone.
A single quote in a name and your program crash. If a user input a name like "Brian O'Conner" can crash your app, it is an SQL injection vulnerability, and the crash is the least of the problems, a malicious user input and it is promoted to SQL commands with all credentials.
SQL injection - Wikipedia[^]
SQL Injection[^]
SQL Injection Attacks by Example[^]
PHP: SQL Injection - Manual[^]
SQL Injection Prevention Cheat Sheet - OWASP[^]
How can I explain SQL injection without technical jargon? - Information Security Stack Exchange[^]
[Update]
From your comment: Take great care to use existing variables

PHP

if(isset($_POST['submit'])){
    //print_r($_POST);die;
    $roll = $_POST['roll_no'];
    $name = $_POST['name'];
    $class = $_POST['class'];
    $date = $_POST['date'];
    $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'];
    $present = $_POST['atten'];
    // echo "INSERT INTO daily_atten(id, roll_no, class, date, subject_name_and_subject_code, subject_handle_by, batch, semester, period1, present) VALUES ('$roll_no','$class','$date','$subject_name_and_subject_code','$subject_handle_by','$batch','$semester','$period','$present')");
    $sql = $db->query("INSERT INTO `daily_atten`(`id`, `roll_no`, `class`, `date`, `subject_name_and_subject_code`, `subject_handle_by`, `batch`, `semester`, `period1`, `present`) VALUES ('$id','$roll_no','$class','$date','$subject_name_and_subject_code','$subject_handle_by','$batch','$semester','$period1','$present')");