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trackback_url( bool $deprecated_echo = true )

Displays the current post’s trackback URL.

Parameters

$deprecated_echo

(bool) (Optional) Not used.

Default value: true

Return

(void|string) Should only be used to echo the trackback URL, use get_trackback_url() for the result instead.

Source

File: wp-includes/comment-template.php 

function trackback_url( $deprecated_echo = true ) {
	if ( true !== $deprecated_echo ) {
		_deprecated_argument(
			__FUNCTION__,
			'2.5.0',
			sprintf(
				/* translators: %s: get_trackback_url() */
				__( 'Use %s instead if you do not want the value echoed.' ),
				'<code>get_trackback_url()</code>'
			)
		);
	}

	if ( $deprecated_echo ) {
		echo get_trackback_url();
	} else {
		return get_trackback_url();
	}
}

Uses

Uses Description
wp-includes/l10n.php: __()

Retrieve the translation of $text.
wp-includes/functions.php: _deprecated_argument()

Mark a function argument as deprecated and inform when it has been used.
wp-includes/comment-template.php: get_trackback_url()

Retrieves the current post’s trackback URL.

Changelog

Version Description
0.71 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/trackback_url