[Shortcode sample] A default WP shortcode reference #wordpress

bartag.php

add_shortcode( 'bartag', 'wpdocs_bartag_func' );
function wpdocs_bartag_func( $atts ) {
    $atts = shortcode_atts( array(
        'foo' => 'no foo',
        'baz' => 'default baz'
    ), $atts, 'bartag' );
 
    return "foo = {$atts['foo']}";
}