Nested Quotes problem in HTML PHP

<?php

function sanitize_quotes($string){
    return htmlspecialchars($string, ENT_QUOTES);
}

$url = "Chateau d'Ouchy";
$surl = sanitize_quotes($url);
echo "<a title='<a href=\"{$surl}\" >{$surl}</a>'>Anchor Text</a>";
?>

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