Call Shortcode

call-shortcode.php

<?php

if ( ! function_exists('call_shortcode') ) :

/**
 * Helper function for calling a shortcode directly
 * 
 * Rather than `echo do_shortcode('[foo bar=the]')` ...
 * 
 * echo call_shortcode('foo', ['bar' => 'the']);
 * 
 * @param  string   $tag     the shortcode [tag]
 * @param  mixed    $atts    array or string of shortcode attributes
 * @param  string   $content inner content of shortcode
 * @return mixed             string - returned output from shortcode
 *                           null if shortcode callback does not exist or is not callable
 */
function call_shortcode( $tag, $atts = [ ], $content = '' )
{
    global $shortcode_tags;
    
    if ( empty( $shortcode_tags[ $tag ] ) || ! is_callable( $shortcode_tags[ $tag ] ) ) {
        trigger_error( __FUNCTION__ . ": shortcode callback for [$tag] is not callable!" );
        return null;
    }

    if ( is_string( $atts ) ) {
        $atts = (array) shortcode_parse_atts( $atts );
    }

    return call_user_func( $shortcode_tags[ $tag ], $atts, $content, $tag );
}

endif;