File includes/types/CMB2_Type_Picker_Base.php

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<?php
/**
 * CMB Picker base field type
 *
 * @since  2.2.2
 *
 * @category  WordPress_Plugin
 * @package   CMB2
 * @author    CMB2 team
 * @license   GPL-2.0+
 * @link      https://cmb2.io
 */
abstract class CMB2_Type_Picker_Base extends CMB2_Type_Text {

    /**
     * Parse the picker attributes.
     *
     * @since  2.2.0
     * @param  string $arg  'date' or 'time'
     * @param  array  $args Optional arguments to modify (else use $this->field->args['attributes'])
     * @return array         Array of field attributes
     */
    public function parse_picker_options( $arg = 'date', $args = array() ) {
        $att    = 'data-' . $arg . 'picker';
        $update = empty( $args );
        $atts   = array();
        $format = $this->field->args( $arg . '_format' );

        if ( $js_format = CMB2_Utils::php_to_js_dateformat( $format ) ) {

            if ( $update ) {
                $atts = $this->field->args( 'attributes' );
            } else {
                $atts = isset( $args['attributes'] )
                    ? $args['attributes']
                    : $atts;
            }

            // Don't override user-provided datepicker values
            $data = isset( $atts[ $att ] )
                ? json_decode( $atts[ $att ], true )
                : array();

            $data[ $arg . 'Format' ] = $js_format;
            $atts[ $att ] = function_exists( 'wp_json_encode' )
                ? wp_json_encode( $data )
                : json_encode( $data );
        }

        if ( $update ) {
            $this->field->args['attributes'] = $atts;
        }

        return array_merge( $args, $atts );
    }
}

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