How to Read If a Checkbox Is Checked in PHP

How to read if a checkbox is checked in PHP?

If your HTML page looks like this:

<input type="checkbox" name="test" value="value1">

After submitting the form you can check it with:

isset($_POST['test'])

or

if ($_POST['test'] == 'value1') ...

How to read if a checkbox is checked in ajax?

Toggle value for ajax using ternary operator:

document.getElementById("ch").checked ? 'y' : 'n'

function in Gravity Forms to read if a checkbox is checked?

Checkboxes have a field ID and input ID. It sounds like you want to check if no checkbox is checked? Here's an simple way to do that:

// Update "123" to your form ID.
add_action( 'gform_pre_submission_123', function( $form ) {

    // The ID of your checkbox field.
    $field_id = 1;

    /** @var GF_Field $field */
    $checkbox_field = GFAPI::get_field( $form, $field_id );
    $value = $checkbox_field->get_value_submission( array() );

    // Just so you can see the data that is returned. Delete this once you have.
    print_r( $value );

    $value = array_filter( $value );
    if ( empty( $value ) ) {
        // Do what you want to.
    }

} );

detect unchecked checkbox php

If a checkbox is not checked it will not be posted. if(!isset($_POST['checkboxname'])) will do the trick.

Be aware, though, you should at least submit something so that you know the form was submitted in the first place.

if (isset($_POST['formWasSubmitted'])) {
    //form was submitted...let's DO this.

    if (!isset($_POST['checkboxname'])) {
        // checkbox was not checked...do something
    } else {
        // checkbox was checked. Rock on!
    }
}

Verifying at least one checkbox is checked php

This is too long for a comment at this point and have already outlined what you need to do in comments.

N.B.: I pulled this from a "now deleted" question as I was going to make a reference to it.

Note that if you're wanting to use the same name attribute for each checkbox, that you need to treat them as arrays using [] for all of them.

I.e.: name="the_name[]"

Base yourself on the following:

<?php

    if(isset($_POST['test'])){
        $a_counts = array();
        foreach($_POST['test'] as $key => $val){
            if(!isset($a_counts[$val])){
                $a_counts[$val] = 1;
            }else{
                $a_counts[$val]++;
            }
            echo $key." => ".$val."<br>";
        }
        print_r($a_counts);
    }
?>
<form action="" method="POST">
    <input type="checkbox" name="test[]" value="red">
    <input type="checkbox" name="test[]" value="green">
    <input type="checkbox" name="test[]" value="yellow">
    <input type="checkbox" name="test[]" value="blue">
    <input type="submit" value="ok">
</form>

Or something like this which would be the better solution:

<form method="post">

    <label class="heading">Select from the following:</label>
    <input type="checkbox" name="check_list[]" value="Value 1"><label>Value 1</label>
    <input type="checkbox" name="check_list[]" value="Value 2"><label>Value 2</label>
    <input type="checkbox" name="check_list[]" value="Value 3"><label>Value 3</label>
    <input type="checkbox" name="check_list[]" value="Value 4"><label>Value 4</label>
    <input type="checkbox" name="check_list[]" value="Value 5"><label>Value 5</label>
    <input type="submit" name="submit" Value="Submit"/>

</form>

<?php 

      if (isset($_POST['submit'])) {
          if (!empty($_POST['check_list'])) {
              // Counting number of checked checkboxes.
              $checked_count = count($_POST['check_list']);
              echo "You have selected following ".$checked_count." option(s): <br/>";
              // Loop to store and display values of individual checked checkbox.
              foreach ($_POST['check_list'] as $selected) {
                  echo "<p>".$selected ."</p>";
              }
          }
          else {
              echo "<b>Please Select at least One Option.</b>";
          }
      }
    ?>

<?php 

if (!empty($_POST['check_list'])) {
          // Counting number of checked checkboxes.
          $checked_count = count($_POST['check_list']);
          echo "You have selected following ".$checked_count." option(s): <br/>";
           // Loop to store and display values of individual checked checkbox.
           foreach ($_POST['check_list'] as $selected) {
               echo "<p>".$selected ."</p>";
           }
       }
       else {
           echo "<b>Please Select at least One Option.</b>";
       }

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