select posts WCK

<?php
 /* @param string $meta Meta name.
 * @param array $details Contains the details for the field.
 * @param string $value Contains input value;
 * @param string $context Context where the function is used. Depending on it some actions are preformed.;
 * @return string $element input element html string. */


wp_reset_postdata();
$details['options'] = array();
$query = new WP_Query( array('post_type' => 'post', 'posts_per_page'=>-1));
while ( $query->have_posts() ) {
    $query->the_post();
    $details['options'][] = get_the_title();

}

wp_reset_postdata();


$element .= '<select multiple name="'. esc_attr( sanitize_title_with_dashes( remove_accents( $details['title'] ) ) ) .'"  id="'. $frontend_prefix . esc_attr( sanitize_title_with_dashes( remove_accents( $details['title'] ) ) ) .'" class="mb-select mb-field" >';

if( !empty( $details['default-option'] ) && $details['default-option'] )
    $element .= '<option value="">'. __('...Chose', 'wck') .'</option>';

if( !empty( $details['options'] ) ){

        $i = 0;
        $options = '';
        foreach( $details['options'] as $option ){

            if( strpos( $option, '%' ) === false ){
                $label = $option;
                if( !empty( $details['values'] ) )
                    $value_attr = $details['values'][$i];
                else
                    $value_attr = $option;
            }
            else{
                $option_parts = explode( '%', $option );
                if( !empty( $option_parts ) ){
                    if( empty( $option_parts[0] ) && count( $option_parts ) == 3 ){
                        $label = $option_parts[1];
                        if( !empty( $details['values'] ) )
                            $value_attr = $details['values'][$i];
                        else
                            $value_attr = $option_parts[2];
                    }
                }
            }

            $options .= '<option value="'. esc_attr( $value_attr ) .'"  '. selected( $value_attr, $value, false ) .' >'. esc_html( $label ) .'</option>';
            $i++;
        }
}
$field_name = sanitize_title_with_dashes( remove_accents( $details['title'] ) );
$element .= apply_filters( "wck_select_{$meta}_{$field_name}_options", $options );
$element .= '</select>';
?>