wp_rel_nofollow( string $text )

Adds rel nofollow string to all HTML A elements in content.

Parameters

$text: (string) (Required) Content that may contain HTML A elements.

Return

(string) Converted content.

Source

File: wp-includes/formatting.php

function wp_rel_nofollow( $text ) {
	// This is a pre save filter, so text is already escaped.
	$text = stripslashes($text);
	$text = preg_replace_callback('|<a (.+?)>|i', 'wp_rel_nofollow_callback', $text);
	return wp_slash( $text );
}

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Changelog

Changelog
Version	Description
WP-1.5.0	Introduced.