ACF Custom field

acf-graphic-radio.php

<?php

class acf_field_graphic_radio extends acf_field {

    function __construct()
    {
        $this->name = 'graphic_radio';
        $this->label = 'Graphic Radio';
        $this->category = 'choice';
        $this->defaults = [
            'per_row' => 4,
            'choices' => []
        ];
        $this->l10n = ['error' => 'Error! Please enter a higher value'];

        parent::__construct();
    }

    function render_field_settings($field)
    {
        $field['choices'] = acf_encode_choices($field['choices']);

        acf_render_field_setting( $field, [
            'label'         => 'Choices',
            'instructions'  => 'type a choice per row like:<br><br>value : url',
            'type'          => 'textarea',
            'name'          => 'choices'
        ]);

        acf_render_field_setting( $field, [
            'label'         => 'Per row',
            'instructions'  => 'How many choices shoud be display pr. row?',
            'type'          => 'number',
            'name'          => 'per_row'
        ]);
    }

    function validate_value($valid, $value, $field, $input)
    {
        return !!trim($value);
    }

    function render_field($field)
    {
        include __DIR__."/view.php";
    }

    function update_field($field)
    {
        // decode choices (convert to array)
        $field['choices'] = acf_decode_choices($field['choices']);

        return $field;
    }
}