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<?php
declare(strict_types=1);
error_reporting(E_ALL);
// student: name roll city email date_of_birth
function connect_to_database() {
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
if (!($dbh = mysqli_connect('localhost', 'root', '')))
display_failure('Could not connect to the database: ' . mysqli_connect_error($dbh));
mysqli_set_charset($dbh, 'utf8mb4');
if (!mysqli_query($dbh, 'CREATE DATABASE IF NOT EXISTS STUDENTS_DB'))
display_failure('Could not create database: ' . mysqli_error($dbh));
mysqli_select_db($dbh, 'STUDENTS_DB');
if (!mysqli_query($dbh, 'CREATE TABLE IF NOT EXISTS STUDENT (
ROLL INT(20) PRIMARY KEY,
NAME VARCHAR(255),
CITY VARCHAR(255),
EMAIL VARCHAR(255),
DATE_OF_BIRTH DATE
)'))
display_failure('Could not create table: ' . mysqli_error($dbh));
return $dbh;
}
function html_prologue($title) {
?><!doctype html>
<meta charset="utf-8">
<title><?php echo $title; ?></title>
<style>
body { font-family: sans-serif; font-size: 1.3rem; }
h1 { font-size: 2rem; font-weight: 500; }
form { margin: 2em auto; width: 20em; }
form input { float: right; }
form input[type=submit] { float: none; display: block; margin: 0 auto; }
form > * { display: block; padding: 0.5em; }
table, tr, th, td { border-collapse: collapse; border: 1px solid black; }
th, td { padding: 5px; }
</style>
<?php
}
function display_form() {
html_prologue('Student details');
?>
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<h1>Enter student's details</h1>
<label>Name: <input type="text" name="name"></label>
<label>Roll No.: <input type="number" name="roll"></label>
<label>City: <input type="text" name="city"></label>
<label>Email: <input type="email" name="email"></label>
<label>Date of birth: <input type="date" name="date_of_birth"></label>
<input type="submit" value="Submit">
<a href="<?php echo $_SERVER['PHP_SELF']; ?>?details">Show students' details</a>
</form>
<?php
}
function display_success() {
html_prologue('Operation successful');
?>
<h2>Insertion successful.</h2>
<?php
}
function display_failure($reason) {
html_prologue('Operation failure');
?>
<h2>Operation failed</h2>
<p>Reason: <?php echo $reason; ?></p>
<?php
die();
}
function check_post_vars($vardesc) {
$vars = [];
foreach ($vardesc as $name => $desc) {
if (!isset($_POST[$name]) || empty($_POST[$name]))
display_failure('The ' . $desc . ' field can not be empty');
$vars[$name] = $_POST[$name];
}
return $vars;
}
function insert_details($dbh) {
$vars = check_post_vars([
'name' => 'Name',
'email' => 'E-mail address',
'date_of_birth' => 'Date of birth',
'city' => 'City',
'roll' => 'Roll No.'
]);
$stmt = mysqli_prepare($dbh, 'INSERT INTO STUDENT (
ROLL, NAME, EMAIL, CITY, DATE_OF_BIRTH
) VALUES (?,?,?,?,?)');
mysqli_stmt_execute($stmt, [
$vars['roll'], $vars['name'], $vars['email'], $vars['city'],
$vars['date_of_birth']
]);
}
function show_table($dbh) {
$result = mysqli_query($dbh, 'SELECT * FROM STUDENT');
html_prologue('Students\' details');
?>
<h2>Students' details</h2>
<p><?php echo mysqli_num_rows($result); ?> record(s) found.</p>
<table>
<tr>
<th>Roll No.</th>
<th>Name</th>
<th>E-mail</th>
<th>City</th>
<th>Date of birth</th>
</tr><?php
while ($row = mysqli_fetch_assoc($result)) { ?>
<tr><td>
<?php echo implode('</td><td>', array_map('htmlspecialchars', [
$row['ROLL'], $row['NAME'], $row['EMAIL'], $row['CITY'],
$row['DATE_OF_BIRTH']
])); ?>
</td></tr>
<?php
} ?>
</table>
<?php
}
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$dbh = connect_to_database();
insert_details($dbh);
display_success();
mysqli_close($dbh);
} elseif (isset($_SERVER['QUERY_STRING'])
&& $_SERVER['QUERY_STRING'] === 'details') {
$dbh = connect_to_database();
show_table($dbh);
mysqli_close($dbh);
} else {
display_form();
}
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