How to print php web form online and set password

With the development of Internet technology, more and more websites need to collect and process user information, and the application of web forms has become an increasingly common method of data collection. As a server-side scripting language, PHP provides convenience for the development and operation of web forms. It can also implement online printing and form protection measures, such as setting passwords.

First of all, PHP can realize the dynamic generation and display of web tables through combination with HTML. In PHP, you can use the following simple code to generate a basic table containing table headers and data:

<table border="1">
  <tr>
    <th>ID</th>
    <th>Name</th>
    <th>Email</th>
  </tr>
  <?php
    $db = new mysqli(&#39;localhost&#39;, &#39;username&#39;, &#39;password&#39;, &#39;database&#39;);
    $result = $db->query("SELECT * FROM users");
    while ($row = $result->fetch_assoc()) {
       echo "<tr>";
       echo "<td>" . $row['id'] . "</td>";
       echo "<td>" . $row['name'] . "</td>";
       echo "<td>" . $row['email'] . "</td>";
       echo "</tr>";
    }
  ?>
</table>

Through the above code, PHP uses the data of the specified table in the MySQL database to dynamically output each row of data in the table , presented on the user's browser interface.

Secondly, in order to facilitate users’ retrieval, saving and sharing, web forms also need to provide online printing functions. PHP provides a JavaScript-based open source library - Print.js to realize the online printing function. Print.js does not require any dependencies, and only three lines of code can be used to implement online printing:

<script src="https://printjs-4de6.kxcdn.com/print.min.js"></script>
<button onclick="printJS()">Print Table</button>

With the above code, users can print the table directly after clicking the "Print Table" button.

Finally, when web forms need to be protected, PHP provides a simple and effective method - setting a password. In PHP, you can dynamically generate a verification password by checking the POST request data, as shown below:

<?php
  $password = &#39;mypassword&#39;;
  if ($_POST[&#39;password&#39;] != $password) {
    echo "Incorrect password!";
  } else {
    echo "Table data here";
  }
?>

Through the above code, when the user enters the password, PHP will determine the correctness of the password. If the password If correct, the table data will be output; if the password is wrong, "incorrect password" will be prompted.

In short, as the application demand for web forms gradually increases, PHP, as a powerful server-side scripting language, continuously provides various functional plug-ins and protection measures for it, making the development and operation of web forms It’s becoming easier and safer.

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