File properties/class-papi-property-user.php

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<?php

/**
 * User property that populates a dropdown.
 */
class Papi_Property_User extends Papi_Property_Dropdown {

    /**
     * The convert type.
     *
     * @var string
     */
    public $convert_type = 'int';

    /**
     * Format the value of the property before it's returned
     * to WordPress admin or the site.
     *
     * @param  mixed  $value
     * @param  string $slug
     * @param  int    $post_id
     *
     * @return array
     */
    public function format_value( $value, $slug, $post_id ) {
        if ( is_object( $value ) && isset( $value->ID ) ) {
            $value = $value->ID;
        }

        if ( is_numeric( $value ) ) {
            return $value === 0 ? null : new WP_User( $value );
        }

        return $value;
    }

    /**
     * Get default settings.
     *
     * @return array
     */
    public function get_default_settings() {
        return [
            'capabilities' => [],
            'placeholder'  => '',
            'select2'      => true
        ];
    }

    /**
     * Get value from database.
     *
     * @return int
     */
    public function get_value() {
        $user = parent::get_value();

        if ( is_object( $user ) && isset( $user->ID ) ) {
            return $user->ID;
        }

        return 0;
    }

    /**
     * Get users as dropdown items.
     *
     * @return array
     */
    public function get_items() {
        $capabilities = papi_to_array( $this->get_setting( 'capabilities' ) );
        $users        = get_users();
        $items        = [];

        foreach ( $users as $user ) {
            $allcaps = $user->allcaps;

            if ( count( array_diff( $capabilities, array_keys( $allcaps ) ) ) === 0 ) {
                $items[$user->display_name] = $user->ID;
            }
        }

        ksort( $items );

        return $items;
    }

    /**
     * Import value to the property.
     *
     * @param  mixed  $value
     * @param  string $slug
     * @param  int    $post_id
     *
     * @return int|null
     */
    public function import_value( $value, $slug, $post_id ) {
        if ( $value instanceof WP_User ) {
            $value = $value->ID;
        }

        if ( is_numeric( $value ) ) {
            return (int) $value;
        }
    }

    /**
     * Change value after it's loaded from the database.
     *
     * @param  mixed  $value
     * @param  string $slug
     * @param  int    $post_id
     *
     * @return int
     */
    public function load_value( $value, $slug, $post_id ) {
        return (int) $value;
    }

    /**
     * Update value before it's saved to the database.
     *
     * @param mixed  $value
     * @param string $slug
     * @param int    $post_id
     *
     * @return int
     */
    public function update_value( $value, $slug, $post_id ) {
        if ( $value instanceof WP_User ) {
            $value = $value->ID;
        }

        return (int) $value;
    }
}

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Functions