Simple php question

[toString]

Why does this work?

while ( $row = mysql_fetch_row($result) ) {
	echo("
		<tr>
			<td>$row[0]</td>
			<td>$row[1]</td>
			<td>".$row[2]."</td>
			<td>".$row[3]."</td>
			<td>".$row[4]."</td>
		</tr>");
}

I would have assumed that row0 and row1 would be printed out as text? But it all works perfectly...

If I were to do the same in classic asp this wouldn't work, it would assume it was all one long string rather than outputting row0 and row1.

Does that make sense?