add_shortcode() WordPress Function

The add_shortcode() function allows you to add your own custom shortcodes to WordPress. A shortcode is a simple set of characters that you can use in your posts and pages to insert content that would otherwise be difficult or impossible to insert. For example, let's say you want to add a button to your posts that says "Click here to buy now". Normally, you would have to add HTML and CSS to your posts to create this button, but with a shortcode, you can simply add the following to your post: [button]Click here to buy now[/button] When this post is displayed, the button shortcode will be replaced with the actual button. Shortcodes can be used to insert images, videos, audio, and other media, as well as complex content like columns, tabs, and sliders. There are two parts to a shortcode: the opening tag (which consists of square brackets "[" and the shortcode name), and the closing tag (which consists of square brackets and a slash "/"). The content that you want to insert goes between the opening and closing tags. To create your own custom shortcodes, you can use the add_shortcode() function. This function takes two parameters: the shortcode name (which is what you'll use in your posts and pages), and a callback function (which is the function that will actually insert the content). Here's an example of how to use the add_shortcode() function to create a custom shortcode: function my_shortcode_callback() { // content to insert goes here } add_shortcode( 'myshortcode', 'my_shortcode_callback' ); In this example, we've created a shortcode called "myshortcode". When this shortcode is used in a post or page, the content from the my_shortcode_callback() function will be inserted. If you want to insert complex content or HTML, you'll need to use the return statement in your callback function. For example: function my_shortcode_callback() { return '

add_shortcode( string $tag, callable $callback ) #

function add_shortcode( $tag, $callback ) {
	global $shortcode_tags;

	if ( '' === trim( $tag ) ) {
		_doing_it_wrong(
			__FUNCTION__,
			__( 'Invalid shortcode name: Empty name given.' ),
			'4.4.0'
		);
		return;
	}

	if ( 0 !== preg_match( '@[<>&/\[\]\x00-\x20=]@', $tag ) ) {
		_doing_it_wrong(
			__FUNCTION__,
			sprintf(
				/* translators: 1: Shortcode name, 2: Space-separated list of reserved characters. */
				__( 'Invalid shortcode name: %1$s. Do not use spaces or reserved characters: %2$s' ),
				$tag,
				'& / < > [ ] ='
			),
			'4.4.0'
		);
		return;
	}

	$shortcode_tags[ $tag ] = $callback;
}