How to read if a checkbox is checked in PHP?

Question

How to read if a checkbox is checked in PHP?

Answer 1

<?php

  if (isset($_POST['add'])) {

    $nama      = $_POST['name'];
    $subscribe = isset($_POST['subscribe']) ? $_POST['subscribe'] : "Not Checked";

    echo "Name: {$nama} <br />";
    echo "Subscribe: {$subscribe}";

    echo "<hr />";   

  }

?>

<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="POST" >

  <input type="text" name="name" /> <br />
  <input type="checkbox" name="subscribe" value="news" /> News <br />

  <input type="submit" name="add" value="Save" />

</form>

Answer 2

Learn about isset which is a built in "function" that can be used in if statements to tell if a variable has been used or set

Example:

    if(isset($_POST["testvariabel"]))
     {
       echo "testvariabel has been set!";
     }

Answer 3

Let your html for your checkbox will be like

<input type="checkbox" name="check1">

Then after submitting your form you need to check like

if (isset($_POST['check1'])) {

    // Checkbox is selected
} else {

   // Alternate code
}

Assuming that check1 should be your checkbox name.And if your form submitting method is GET then you need to check with $_GET variables like

if (isset($_GET['check1'])) {

   // Checkbox is selected
} 

Answer 4

<?php

if(isset($_POST['nameCheckbox'])){
    $_SESSION['fr_nameCheckbox'] = true;
}

?>

<input type="checkbox" name="nameCheckbox" 

<?php 

if(isset($_SESSION['fr_nameCheckbox'])){
    echo 'checked'; 
    unset($_SESSION['fr_nameCheckbox']);
} 

?>