Source of class-acf-field-radio.php - main

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            'instructions'  => __('Enter each choice on a new line.','acf') . '<br /><br />' . __('For more control, you may specify both a value and label like this:','acf'). '<br /><br />' . __('red : Red','acf'),
 
<?php
​
if( ! class_exists('acf_field_radio') ) :
​
class acf_field_radio extends acf_field {
    
    
    /*
    *  __construct
    *
    *  This function will setup the field type data
    *
    *  @type    function
    *  @date    5/03/2014
    *  @since   5.0.0
    *
    *  @param   n/a
    *  @return  n/a
    */
    
    function initialize() {
        
        // vars
        $this->name = 'radio';
        $this->label = __("Radio Button",'acf');
        $this->category = 'choice';
        $this->defaults = array(
            'layout'            => 'vertical',
            'choices'           => array(),
            'default_value'     => '',
            'other_choice'      => 0,
            'save_other_choice' => 0,
            'allow_null'        => 0,
            'return_format'     => 'value'
        );
        
    }
    
        
    /*
    *  render_field()
    *
    *  Create the HTML interface for your field
    *
    *  @param   $field (array) the $field being rendered
    *
    *  @type    action
    *  @since   3.6
    *  @date    23/01/13
    *
    *  @param   $field (array) the $field being edited
    *  @return  n/a
    */
    
    function render_field( $field ) {
​
        // vars
        $e = '';
        $ul = array( 
            'class'             => 'acf-radio-list',
            'data-allow_null'   => $field['allow_null'],
            'data-other_choice' => $field['other_choice']
        );