show hello <br /> world

<script>
function myfunction(mydata)
{
   alert(mydata)
}
</script>
<?php
$data = nl2br("hello \n world");
$data = preg_replace( "/\r|\n/", "", $data );
echo '<a href="javascript:void(0);" onClick="myfunction(\'' . $data . '\');">Click</a>';
?>