public function select_callback( $args, $value = null ) {

        if ( isset ( $args['select2'] ) ) {
            $args['class'] .= '  pum-field-select2';
		}

        if ( ! $value ) {
            $value = isset( $args['std'] ) ? $args['std'] : '';
        }

        $multiple = null;
        if ( $args['multiple'] ) {
            $multiple = 'multiple';
            $args['class'] .= '  pum-field-select--multiple';
            $args['name'] .= $args['as_array'] ? '[]' : '';
            $value = ! is_array( $value ) ? array( $value ) : $value;
        }

		$this->field_before( $args );

		$this->field_label( $args ); ?>

	    <select id="<?php echo esc_attr( $args['id'] ); ?>" name="<?php echo esc_attr( $args['name'] ); ?>" data-placeholder="<?php echo esc_attr( $args['placeholder'] ); ?>" data-allow-clear="true" <?php echo $multiple; ?> <?php if ( $args['required'] ) { echo 'required'; } ?>>
		<?php if ( ! empty( $args['options'] ) ) {
			foreach ( $args['options'] as $label => $option ) {
			    $selected = ( ! $multiple && $option == $value ) || ( $multiple && in_array( $option, $value ) ); ?>
				<option value="<?php echo esc_attr( $option ); ?>" <?php selected( 1, $selected ); ?>><?php echo esc_html( $label ); ?></option><?php
			}
		} ?>
		</select><?php

		$this->field_description( $args );

		$this->field_after();
	}