Wordpress shortcode

<?php add_shortcode( $tag , $func ); ?>

 
<?php

function projects_view( $atts ) {
    $atts = shortcode_atts( array(
        'attribute_name' => 'default attribute',
    ), $atts );

    $html = '';
    $html .= "you output with attribute is ".$attribute_name;
    return $html;
}
add_shortcode( 'projects', 'projects_view' );


If your plugin is designed as a class write as follows:

class Projects {
    function projects_view( $atts, $content="" ) {
        $atts = shortcode_atts( array(
            'attribute_name' => 'default attribute',
        ), $atts );
        return "content = $content";
    }
}
add_shortcode( 'projects', array( 'Projects', 'projects_view' ) );

?>

Display proccess  in page content
[projects attribute_name="new"]

Display process in php code
 
<?php echo do_shortcode( $content ) ?>

<?php echo do_shortcode('[projects attribute_name="new"]') ?>


Call a navigation menu using a shortcode

function print_menu_shortcode($atts, $content = null) {
    extract(shortcode_atts(array( 'name' => null, ), $atts));
    return wp_nav_menu( array( 'menu' => $name, 'echo' => false ) );
}
add_shortcode('menu', 'print_menu_shortcode');


Place this in functions.php, then use [menu name="main-menu"] to call the menu in your content (replacing "main-menu" with your menu’s slug, of course).