Array indexing problems

[Anon]

I have a $row from mysql_fetch_array, and a field name in $this->match_row.

When I do the following it doesn't work:
if (stristr($row[$this->match_field], $this->match_string)!=false) {

even when it should.

I broke it down into:
$s=$this->match_field; // this is ok
$t=$row[$s]; // this comes out blank.

I also tried:
$t=$row[$this->match_field]
and
$t=$row["$this->match_field"] to no avail.

Anyone done this before?
Thanks!

[Anon]

Oh, $row is passed in to the class.

I found a simulat one, but it said to use mysql_get_object, but that is not a possiliby here because the row is uses elsewhere for a second stage pf processing and would be lots of work to modify.