<?php

$buf= "This\tis\tmy\nstring\nwith\ttabs\nand\tnewlines\n.";

$buf_explode=explode("\n",$buf);

for($i=0;$i<count($buf_explode);$i++){
    echo $buf_explode[$i]."<br>";
};

This	is	my<br>string<br>with	tabs<br>and	newlines<br>.<br>