geodirectory-website-qr-shortcode.php

<?php

add_shortcode( 'gd_qr_code', 'gd_qr_code_shortcode' );
function gd_qr_code_shortcode( $atts ) {
    $atts = shortcode_atts(
        array(
            'url'   => '',
            'size'  => '150',
            'alt'   => '',
            'class' => 'img-responsive',
            'style' => '',
        ),
        $atts,
        'gd_qr_code'
    );

    // If no URL is provided, fetch from post meta.
    if ( empty( $atts['url'] ) ) {
        $atts['url'] = do_shortcode( '[gd_post_meta key="website" show="value-strip" no_wrap="1"]' );
    }

    // Abort if no URL is provided.
    if ( empty( $atts['url'] ) ) {
        return '';
    }

    return printf(
        '<img src="https://chart.googleapis.com/chart?chs=%1$sx%1$s&cht=qr&chl=%2$s" alt="%3$s" class="%4$s" style="%5$s">',
        absint( $atts['size'] ),
        esc_url( $atts['url'] ),
        empty( $atts['alt'] ) ? esc_attr( $atts['url'] ) : esc_attr( $atts['alt'] ),
        esc_attr( $atts['class'] ),
        esc_attr( $atts['style'] )
    );

}