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<?php
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// Include config file
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require_once "config.php";
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// Define variables and initialize with empty values
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$name = $address = $salary = "";
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$name_err = $address_err = $salary_err = "";
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// Processing form data when form is submitted
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if(isset($_POST["id"]) && !empty($_POST["id"])){
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// Get hidden input value
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$id = $_POST["id"];
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// Validate name
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$input_name = trim($_POST["name"]);
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if(empty($input_name)){
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$name_err = "Please enter a name.";
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} elseif(!filter_var($input_name, FILTER_VALIDATE_REGEXP, array("options"=>array("regexp"=>"/^[a-zA-Z\s]+$/")))){
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$name_err = "Please enter a valid name.";
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} else{
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$name = $input_name;
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}
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// Validate address address
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$input_address = trim($_POST["address"]);
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if(empty($input_address)){
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$address_err = "Please enter an address.";
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} else{
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$address = $input_address;
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}
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// Validate salary
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$input_salary = trim($_POST["salary"]);
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if(empty($input_salary)){
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$salary_err = "Please enter the salary amount.";
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} elseif(!ctype_digit($input_salary)){
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$salary_err = "Please enter a positive integer value.";
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} else{
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$salary = $input_salary;
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}
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// Check input errors before inserting in database
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if(empty($name_err) && empty($address_err) && empty($salary_err)){
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// Prepare an update statement
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$sql = "UPDATE employees SET name=?, address=?, salary=? WHERE id=?";
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if($stmt = mysqli_prepare($link, $sql)){
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// Bind variables to the prepared statement as parameters
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mysqli_stmt_bind_param($stmt, "sssi", $param_name, $param_address, $param_salary, $param_id);
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// Set parameters
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$param_name = $name;
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$param_address = $address;
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$param_salary = $salary;
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$param_id = $id;
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// Attempt to execute the prepared statement
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if(mysqli_stmt_execute($stmt)){
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// Records updated successfully. Redirect to landing page
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header("location: index.php");
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exit();
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} else{
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echo "Oops! Something went wrong. Please try again later.";
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}
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}
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// Close statement
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mysqli_stmt_close($stmt);
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}
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// Close connection
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mysqli_close($link);
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} else{
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// Check existence of id parameter before processing further
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if(isset($_GET["id"]) && !empty(trim($_GET["id"]))){
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// Get URL parameter
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$id = trim($_GET["id"]);
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// Prepare a select statement
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$sql = "SELECT * FROM employees WHERE id = ?";
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if($stmt = mysqli_prepare($link, $sql)){
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// Bind variables to the prepared statement as parameters
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mysqli_stmt_bind_param($stmt, "i", $param_id);
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// Set parameters
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$param_id = $id;
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// Attempt to execute the prepared statement
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if(mysqli_stmt_execute($stmt)){
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$result = mysqli_stmt_get_result($stmt);
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if(mysqli_num_rows($result) == 1){
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/* Fetch result row as an associative array. Since the result set
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contains only one row, we don't need to use while loop */
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$row = mysqli_fetch_array($result, MYSQLI_ASSOC);
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// Retrieve individual field value
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$name = $row["name"];
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$address = $row["address"];
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$salary = $row["salary"];
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} else{
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// URL doesn't contain valid id. Redirect to error page
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header("location: error.php");
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exit();
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}
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} else{
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echo "Oops! Something went wrong. Please try again later.";
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}
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}
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// Close statement
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mysqli_stmt_close($stmt);
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// Close connection
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mysqli_close($link);
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} else{
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// URL doesn't contain id parameter. Redirect to error page
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header("location: error.php");
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exit();
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}
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}
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?>
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Update Record</title>
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<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
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<style>
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.wrapper{
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width: 600px;
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margin: 0 auto;
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}
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</style>
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</head>
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<body>
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<div class="wrapper">
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<div class="container-fluid">
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<div class="row">
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<div class="col-md-12">
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<h2 class="mt-5">Update Record</h2>
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<p>Please edit the input values and submit to update the employee record.</p>
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<form action="<?php echo htmlspecialchars(basename($_SERVER['REQUEST_URI'])); ?>" method="post">
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<div class="form-group">
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<label>Name</label>
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<input type="text" name="name" class="form-control <?php echo (!empty($name_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $name; ?>">
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<span class="invalid-feedback"><?php echo $name_err;?></span>
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</div>
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<div class="form-group">
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<label>Address</label>
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<textarea name="address" class="form-control <?php echo (!empty($address_err)) ? 'is-invalid' : ''; ?>"><?php echo $address; ?></textarea>
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<span class="invalid-feedback"><?php echo $address_err;?></span>
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</div>
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<div class="form-group">
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<label>Salary</label>
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<input type="text" name="salary" class="form-control <?php echo (!empty($salary_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $salary; ?>">
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<span class="invalid-feedback"><?php echo $salary_err;?></span>
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</div>
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<input type="hidden" name="id" value="<?php echo $id; ?>"/>
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<input type="submit" class="btn btn-primary" value="Submit">
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<a href="index.php" class="btn btn-secondary ml-2">Cancel</a>
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</form>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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