shortcode_exists() WP 1.0

Whether a registered shortcode exists named $tag

Notes:

Global. Array. $shortcode_tags List of shortcode tags and their callback hooks.

✈ 1 time = 0.000011s = very fast | 50000 times = 0.02s = speed of light PHP 7.1.5, WP 4.8.2

No Hooks.

true/false. Whether the given shortcode exists.

shortcode_exists( $tag );

<?php
function shortcode_exists( $tag ) {
	global $shortcode_tags;
	return array_key_exists( $tag, $shortcode_tags );
}