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Add hook for shortcode tag.

There can only be one hook for each shortcode. Which means that if another plugin has a similar shortcode, it will override yours or yours will override theirs depending on which order the plugins are included and/or ran.

Simplest example of a shortcode tag using the API:

// [footag foo="bar"]
function footag_func($atts) {
    return "foo = {$atts[foo]}";
}
add_shortcode('footag', 'footag_func');

Example with nice attribute defaults:

// [bartag foo="bar"]
function bartag_func($atts) {
    extract(shortcode_atts(array(
        'foo' => 'no foo',
        'baz' => 'default baz',
    ), $atts));

    return "foo = {$foo}";
}
add_shortcode('bartag', 'bartag_func');

Example with enclosed content:

// [baztag]content[/baztag]
function baztag_func($atts, $content='') {
    return "content = $content";
}
add_shortcode('baztag', 'baztag_func');