Wordpress: Get the select field option choices in ACF (Advanced Post Field) plugin?

Question

I'm now using Advanced Custom Fields Plugin in wordpress.

And now I defined some Choices, and they have Choices set as below:

Field Name: time_availability

Field Type: Select

low : Once or twice
high : Several times

So, I want to enumerate these settings in the page code, like rendering:

<ul>
  <li><input type="radio" name="low" /> Once or twice</li>
  <li><input type="radio" name="high" /> Several times</li>
</ul>

How can I get the choices?

---

Update:

Seemed if calling the get_field_object($field_name) may got the entire field settings, including the choices.

But when I call the function with the field name, the below is returned:

array(18) {
  ["key"]=>
  string(33) "field_time_availability"
  ["label"]=>
  string(0) ""
  ["name"]=>
  string(27) "time_availability"
  ["_name"]=>
  string(27) "time_availability"
  ["type"]=>
  string(4) "text"
  ["order_no"]=>
  int(1)
  ["instructions"]=>
  string(0) ""
  ["required"]=>
  int(0)
  ["id"]=>
  string(37) "acf-field-time_availability"
  ["class"]=>
  string(4) "text"
  ["conditional_logic"]=>
  array(3) {
    ["status"]=>
    int(0)
    ["allorany"]=>
    string(3) "all"
    ["rules"]=>
    int(0)
  }
  ["default_value"]=>
  string(0) ""
  ["formatting"]=>
  string(4) "html"
  ["maxlength"]=>
  string(0) ""
  ["placeholder"]=>
  string(0) ""
  ["prepend"]=>
  string(0) ""
  ["append"]=>
  string(0) ""
  ["value"]=>
  bool(false)
}

Not the expecting result.

While if I call that function with the raw field name:

get_field_object('field_55df081515e81');

It goes right!

What's the matter? What's the difference and how can I get it right using the field_name?

Answer 1

On ACFs site they state:

"The API will return the selected value. If you select the multiple option for this field, the API will return an array of values."

So try the following:

// get the selected value
$value = get_field('time_availability');
?>

<ul>
  <li><input type="radio" name="low" <?php echo ($value == 'low'?'checked="checked"':''); ?>/> Once or twice</li>
  <li><input type="radio" name="high" <?php echo ($value == 'high'?'checked="checked"':''); ?>/> Several times</li>
</ul>

If you have enabled the selection of multiple values, you should use checkboxes instead of radios.

---

To access the available choices, you have to get the field object.

// choose the field
$field_name = 'time_availability';
$field = get_field_object($field_name);

if( $field )
{
    // build the form
    echo '<select name="' . $field['key'] . '">';
        foreach( $field['choices'] as $k => $v )
        {
            echo '<option value="' . $k . '">' . $v . '</option>';
        }
    echo '</select>';
}

---

To get the field object from a user, use this notation:

$user_id = 2;  // the id of the user
$field_name = 'your_field';  // the name of the field
get_field_object($field_name, 'user_.'.$user_id)