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update.php
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<?php
# Include connection
require_once "./config.php";
# Define variables and initialize with empty values
$fname_err = $lname_err = $email_err = $age_err = $gender_err = $designation_err = $date_err = "";
$fname = $lname = $email = $age = $gender = $designation = "";
# Processing form data when form is submitted
if (isset($_POST["id"]) && !empty($_POST["id"])) {
# Get hidden input value
$id = $_POST["id"];
if (empty(trim($_POST["fname"]))) {
$fname_err = "This field is required.";
} else {
$fname = ucfirst(trim($_POST["fname"]));
if (!ctype_alpha($fname)) {
$fname_err = "Invalid name format.";
}
}
if (empty(trim($_POST["lname"]))) {
$lname_err = "This field is required.";
} else {
$lname = ucfirst(trim($_POST["lname"]));
if (!ctype_alpha($lname)) {
$lname_err = "Invalid name format.";
}
}
if (empty(trim($_POST["email"]))) {
$email_err = "This field is required.";
} else {
$email = filter_var($_POST["email"], FILTER_SANITIZE_EMAIL);
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$email_err = "Please enter a valid email address.";
}
}
if (empty(trim($_POST["age"]))) {
$age_err = "This field is required.";
} else {
$age = trim($_POST["age"]);
if (!ctype_digit($age)) {
$age_err = "Please enter a valid age number";
}
}
if (empty($_POST["gender"])) {
$gender_err = "This field is required.";
} else {
$gender = $_POST["gender"];
}
if (empty($_POST["designation"])) {
$designation_err = "This field is required.";
} else {
$designation = $_POST["designation"];
}
if (empty($_POST["date"])) {
$date_err = "This field is required";
} else {
$date = $_POST["date"];
}
# Check input errors before updating data from database
if (empty($fname_err) && empty($lname_err) && empty($email_err) && empty($age_err) && empty($gender_err) && empty($designation_err) && empty($date_err)) {
# Preapre an update statement
$sql = "UPDATE employees SET first_name = ?, last_name = ?, email = ?, age = ?, gender = ?, designation = ?, joining_date = ? WHERE id = ?";
if ($stmt = mysqli_prepare($link, $sql)) {
# Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "sssisssi", $param_fname, $param_lname, $param_email, $param_age, $param_gender, $param_designation, $param_date, $param_id);
# Set parameters
$param_fname = $fname;
$param_lname = $lname;
$param_email = $email;
$param_age = $age;
$param_gender = $gender;
$param_designation = $designation;
$param_date = $date;
$param_id = $id;
# Execute the statement
if (mysqli_stmt_execute($stmt)) {
echo "<script>" . "alert('Record has been updated successfully.');" . "</script>";
echo "<script>" . "window.location.href='./'" . "</script>";
exit;
} else {
echo "Oops! Something went wrong. Please try again later.";
}
}
# Close statement
mysqli_stmt_close($stmt);
}
# Close connection
mysqli_close($link);
} else {
# Check if URL contains id parameter before processing further
if (isset($_GET["id"]) && !empty(trim($_GET["id"]))) {
# Get URL paramater
$id = trim($_GET["id"]);
# Prepare a select statement
$sql = "SELECT * FROM employees WHERE id = ?";
if ($stmt = mysqli_prepare($link, $sql)) {
# Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "i", $param_id);
# Set Parameters
$param_id = $id;
# Execute the statement
if (mysqli_stmt_execute($stmt)) {
$result = mysqli_stmt_get_result($stmt);
if (mysqli_num_rows($result) == 1) {
# Fetch result row as an associative array
$row = mysqli_fetch_array($result);
# Retrieve individual field value
$fname = $row["first_name"];
$lname = $row["last_name"];
$email = $row["email"];
$age = $row["age"];
$gender = $row["gender"];
$designation = $row["designation"];
$date = $row["joining_date"];
} else {
# URL doesn't contain valid id parameter. Redirect to index page
echo "<script>" . "window.location.href='./'" . "</script>";
exit;
}
} else {
echo "Oops! Something went wrong. Please try again later";
}
}
# Close statement
mysqli_stmt_close($stmt);
# Close connection
mysqli_close($link);
} else {
# Redirect to index.php if URL doesn't contain id parameter
echo "<script>" . "window.location.href='./'" . "</script>";
exit;
}
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-Zenh87qX5JnK2Jl0vWa8Ck2rdkQ2Bzep5IDxbcnCeuOxjzrPF/et3URy9Bv1WTRi" crossorigin="anonymous">
<link rel="stylesheet" href="./style.css">
<link rel="shortcut icon" href="./favicon.ico" type="image/x-icon">
<title>PHP CRUD Operations</title>
</head>
<body>
<div class="container">
<div class="row justify-content-center mt-5">
<div class="col-lg-6">
<!-- form starts here -->
<form action="<?= htmlspecialchars(basename($_SERVER["REQUEST_URI"])); ?>" class="bg-light p-4 shadow-sm" method="post" novalidate>
<div class="row gy-3">
<div class="col-lg-6">
<label for="fname" class="form-label">First Name</label>
<input type="text" class="form-control" name="fname" id="fname" value="<?= $fname; ?>">
<small class="text-danger"><?= $fname_err; ?></small>
</div>
<div class="col-lg-6">
<label for="lname" class="form-label">Last Name</label>
<input type="text" class="form-control" name="lname" id="lname" value="<?= $lname; ?>">
<small class="text-danger"><?= $lname_err; ?></small>
</div>
<div class="col-lg-12">
<label for="email" class="form-label">Email Address</label>
<input type="email" class="form-control" name="email" id="email" value="<?= $email; ?>">
<small class="text-danger"><?= $email_err; ?></small>
</div>
<div class="col-lg-6">
<label for="age" class="form-label">Age</label>
<input type="text" class="form-control" name="age" id="age" value="<?= $age; ?>">
<small class="text-danger"><?= $age_err; ?></small>
</div>
<div class="col-lg-6">
<label for="gender" class="form-label">Gender</label>
<select name="gender" class="form-select" id="gender">
<option selected disabled>Select Gender</option>
<option value="Male" <?= (isset($gender) && $gender == "Male") ? "selected" : ""; ?>>Male</option>
<option value="Female" <?= (isset($gender) && $gender == "Female") ? "selected" : ""; ?>>Female</option>
<option value="Others" <?= (isset($gender) && $gender == "Others") ? "selected" : ""; ?>>Others</option>
</select>
<small class="text-danger"><?= $gender_err; ?></small>
</div>
<div class="col-lg-6">
<label for="designation" class="form-label">Designation</label>
<select name="designation" class="form-select" id="designation">
<option selected disabled>Select Designation</option>
<option value="UI Designer" <?= (isset($designation) && $designation == "UI Designer") ? "selected" : ""; ?>>
UI Designer
</option>
<option value="Frontend Developer" <?= (isset($designation) && $designation == "Frontend Developer") ? "selected" : ""; ?>>
Frontend Developer
</option>
<option value="PHP Developer" <?= (isset($designation) && $designation == "PHP Developer") ? "selected" : ""; ?>>
PHP Developer
</option>
<option value="Android Developer" <?= (isset($designation) && $designation == "Android Developer") ? "selected" : ""; ?>>
Android Developer
</option>
</select>
<small class="text-danger"><?= $designation_err; ?></small>
</div>
<div class="col-lg-6">
<label for="date" class="form-label">Joining Date</label>
<input type="date" class="form-control" name="date" id="date" value="<?= $date; ?>">
<small class="text-danger"><?= $date_err; ?></small>
</div>
<div class="col-lg-12 d-grid">
<input type="hidden" class="form-control" name="id" value="<?= $id; ?>">
<button type="submit" class="btn btn-primary">Update Employee</button>
</div>
</div>
</form>
<!-- form ends here -->
</div>
</div>
</div>
</body>