class-gravityview-powered-by.php

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<?php


/** If this file is called directly, abort. */
if ( ! defined( 'GRAVITYVIEW_DIR' ) ) {
    die();
}

/**
 * Add a Powered By link below Views.
 *
 * @since 2.5.3
 *
 */
class GravityView_Powered_By {

    const url = 'https://www.gravitykit.com/powered-by/';

    /**
     * GravityView_Powered_By constructor.
     */
    public function __construct() {
        add_action( 'gravityview/template/after', array( $this, 'maybe_add_link' ) );
    }

    /**
     * Prints a HTML link to GravityView's site if "Powered By" GravityView setting is enabled
     *
     * @return void
     */
    public function maybe_add_link() {

        $powered_by = gravityview()->plugin->settings->get_gravitykit_setting( 'powered_by', 0 );

        if( empty( $powered_by ) ) {
            return;
        }

        $url = $this->get_url();

        // Allow disabling link via URL filter
        if ( empty( $url ) ) {
            return;
        }

        /**
         * @filter `gravityview/powered_by/text` Modify the anchor text for the Powered By link
         * @param string $anchor_text Anchor text for the Powered By link. Default: "Powered by GravityView". Will be sanitized before display.
         */
        $anchor_text = apply_filters( 'gravityview/powered_by/text', __( 'Powered by GravityView', 'gk-gravityview' ) );

        printf( '<span class="gv-powered-by"><a href="%s">%s</a></span>', esc_url( $url ), esc_html( $anchor_text ) );
    }

    /**
     * Returns the URL to GravityView
     *
     * @return string URL to GravityView (not sanitized)
     */
    protected function get_url() {

        $url = sprintf( self::url, get_bloginfo('name' ) );

        $affiliate_id = gravityview()->plugin->settings->get_gravitykit_setting( 'affiliate_id', '' );

        if( $affiliate_id && is_numeric( $affiliate_id ) ) {
            $url = add_query_arg( array( 'ref' => $affiliate_id ), $url );
        }

        $url = add_query_arg( array(
            'utm_source' => 'powered_by',
            'utm_term' => get_bloginfo('name' ),
        ), $url );

        /**
         * @filter `gravityview/powered_by/url` Modify the URL returned by the Powered By link
         * @param $url string The URL passed to the Powered By link
         */
        $url = apply_filters( 'gravityview/powered_by/url', $url );

        return $url;
    }
}

new GravityView_Powered_By();