How can the PHP code be modified to accurately count the number of selected checkboxes when the button is pressed?

The PHP code can be modified by using an array to store the values of the selected checkboxes and then counting the number of elements in that array when the button is pressed. This can be done by iterating through the $_POST array and checking for the presence of the checkbox values. The count of the selected checkboxes can then be displayed or used as needed. 

<?php
if(isset($_POST['submit'])){
    $selectedCheckboxes = $_POST['checkbox']; // Assuming 'checkbox' is the name attribute of the checkboxes
    $numSelected = count($selectedCheckboxes);
    
    echo "Number of selected checkboxes: " . $numSelected;
}
?>

<form method="post">
    <input type="checkbox" name="checkbox[]" value="1"> Checkbox 1
    <input type="checkbox" name="checkbox[]" value="2"> Checkbox 2
    <input type="checkbox" name="checkbox[]" value="3"> Checkbox 3
    <input type="submit" name="submit" value="Submit">
</form>

Keywords

PHP checkboxes count button event handler

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