How can the $_POST array be used to retrieve the selected radio button value in PHP?

To retrieve the selected radio button value using the $_POST array in PHP, you need to ensure that the radio buttons are within a form element with a method attribute set to "post". When the form is submitted, the selected radio button value will be available in the $_POST array with the name attribute of the radio button as the key. 

<form method="post">
  <input type="radio" name="gender" value="male"> Male
  <input type="radio" name="gender" value="female"> Female
  <input type="submit" name="submit" value="Submit">
</form>

<?php
if(isset($_POST['submit'])){
  $selectedGender = $_POST['gender'];
  echo "Selected gender: " . $selectedGender;
}
?>

Keywords

$_POST radio button value retrieve PHP

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