_make_web_ftp_clickable_cb() │ WP 2.3.2

Callback to convert URL match to HTML A element.

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

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

No Hooks.

Returns

String. HTML A element with URL address.

Usage

_make_web_ftp_clickable_cb( $matches );
$matches(array) (required)
Single Regex Match.

Changelog

Since 2.3.2 Introduced.

_make_web_ftp_clickable_cb() code WP 6.8.1

wp-includes/formatting.php 
function _make_web_ftp_clickable_cb( $matches ) {
	$ret  = '';
	$dest = $matches[2];
	$dest = 'http://' . $dest;

	// Removed trailing [.,;:)] from URL.
	$last_char = substr( $dest, -1 );
	if ( in_array( $last_char, array( '.', ',', ';', ':', ')' ), true ) === true ) {
		$ret  = $last_char;
		$dest = substr( $dest, 0, strlen( $dest ) - 1 );
	}

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

	$rel_attr = _make_clickable_rel_attr( $dest );

	return $matches[1] . "<a href=\"{$dest}\"{$rel_attr}>{$dest}</a>{$ret}";
}