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_make_url_clickable_cb( array $matches )

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

Callback to convert URI match to HTML A element.

Description

This function was backported from 2.5.0 to 2.3.2. Regex callback for make_clickable().

Parameters

$matches

(array) (Required) Single Regex Match.

Return

(string) HTML A element with URI address.

Source

File: wp-includes/formatting.php 

function _make_url_clickable_cb( $matches ) {
	$url = $matches[2];

	if ( ')' === $matches[3] && strpos( $url, '(' ) ) {
		// If the trailing character is a closing parethesis, and the URL has an opening parenthesis in it,
		// add the closing parenthesis to the URL. Then we can let the parenthesis balancer do its thing below.
		$url   .= $matches[3];
		$suffix = '';
	} else {
		$suffix = $matches[3];
	}

	// Include parentheses in the URL only if paired.
	while ( substr_count( $url, '(' ) < substr_count( $url, ')' ) ) {
		$suffix = strrchr( $url, ')' ) . $suffix;
		$url    = substr( $url, 0, strrpos( $url, ')' ) );
	}

	$url = esc_url( $url );
	if ( empty( $url ) ) {
		return $matches[0];
	}

	if ( 'comment_text' === current_filter() ) {
		$rel = 'nofollow ugc';
	} else {
		$rel = 'nofollow';
	}

	/**
	 * Filters the rel value that is added to URL matches converted to links.
	 *
	 * @since 5.3.0
	 *
	 * @param string $rel The rel value.
	 * @param string $url The matched URL being converted to a link tag.
	 */
	$rel = apply_filters( 'make_clickable_rel', $rel, $url );
	$rel = esc_attr( $rel );

	return $matches[1] . "<a href=\"$url\" rel=\"$rel\">$url</a>" . $suffix;
}

Uses

Uses Description
wp-includes/formatting.php: make_clickable_rel

Filters the rel value that is added to URL matches converted to links.
wp-includes/formatting.php: esc_url()

Checks and cleans a URL.
wp-includes/formatting.php: esc_attr()

Escaping for HTML attributes.
wp-includes/plugin.php: current_filter()

Retrieve the name of the current filter or action.
wp-includes/plugin.php: apply_filters()

Calls the callback functions that have been added to a filter hook.

Changelog

Version Description
2.3.2 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/_make_url_clickable_cb