wp_rel_nofollow() WP 1.0

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

No Hooks.

Return

String. Converted content.

Usage

wp_rel_nofollow( $text );

$text(string) (required)

Content that may contain HTML A elements.

Code of wp rel nofollow: wp-includes/formatting.php ^{VER 5.0.3}

<?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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From tag: sanitize_

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