do_shortcode_tag()WP 2.5.0

Regular Expression callable for do_shortcode() for calling shortcode hook.

Internal function — this function is designed to be used by the kernel itself. It is not recommended to use this function in your code.

Hooks from the function

Return

String. Shortcode output.

Usage

do_shortcode_tag( $m );
$m(array) (required)

Regular expression match array.

  • 0(string)
    Entire matched shortcode text.

  • 1(string)
    Optional second opening bracket for escaping shortcodes.

  • 2(string)
    Shortcode name.

  • 3(string)
    Shortcode arguments list.

  • 4(string)
    Optional self closing slash.

  • 5(string)
    Content of a shortcode when it wraps some content.

  • 6(string)
    Optional second closing brocket for escaping shortcodes.

Notes

Changelog

Since 2.5.0 Introduced.

do_shortcode_tag() code WP 6.4.3

function do_shortcode_tag( $m ) {
	global $shortcode_tags;

	// Allow [[foo]] syntax for escaping a tag.
	if ( '[' === $m[1] && ']' === $m[6] ) {
		return substr( $m[0], 1, -1 );
	}

	$tag  = $m[2];
	$attr = shortcode_parse_atts( $m[3] );

	if ( ! is_callable( $shortcode_tags[ $tag ] ) ) {
		_doing_it_wrong(
			__FUNCTION__,
			/* translators: %s: Shortcode tag. */
			sprintf( __( 'Attempting to parse a shortcode without a valid callback: %s' ), $tag ),
			'4.3.0'
		);
		return $m[0];
	}

	/**
	 * Filters whether to call a shortcode callback.
	 *
	 * Returning a non-false value from filter will short-circuit the
	 * shortcode generation process, returning that value instead.
	 *
	 * @since 4.7.0
	 *
	 * @param false|string $output Short-circuit return value. Either false or the value to replace the shortcode with.
	 * @param string       $tag    Shortcode name.
	 * @param array|string $attr   Shortcode attributes array or the original arguments string if it cannot be parsed.
	 * @param array        $m      Regular expression match array.
	 */
	$return = apply_filters( 'pre_do_shortcode_tag', false, $tag, $attr, $m );
	if ( false !== $return ) {
		return $return;
	}

	$content = isset( $m[5] ) ? $m[5] : null;

	$output = $m[1] . call_user_func( $shortcode_tags[ $tag ], $attr, $content, $tag ) . $m[6];

	/**
	 * Filters the output created by a shortcode callback.
	 *
	 * @since 4.7.0
	 *
	 * @param string       $output Shortcode output.
	 * @param string       $tag    Shortcode name.
	 * @param array|string $attr   Shortcode attributes array or the original arguments string if it cannot be parsed.
	 * @param array        $m      Regular expression match array.
	 */
	return apply_filters( 'do_shortcode_tag', $output, $tag, $attr, $m );
}