What's all this in my /tmp?

[TheMatrix]

Hello-

I can't seem to figure out why my new server is generating thousands of files in /tmp, owned by apache.

-rw------- 1 apache apache 2.0K Jan 29 02:39 gqehR4
-rw------- 1 apache apache 2.7K Jan 25 14:55 Gr4PDF
-rw------- 1 apache apache 470 Feb 2 21:51 grHyIP
-rw------- 1 apache apache 568 Jan 27 17:35 GRmYfY
-rw------- 1 apache apache 2.7K Feb 3 08:30 gRs1AS
-rw------- 1 apache apache 2.0K Jan 28 16:44 gStj7q
-rw------- 1 apache apache 692 Jan 31 10:01 GtEu3v
-rw------- 1 apache apache 664 Feb 3 22:09 GTKp0v
-rw------- 1 apache apache 817 Feb 1 21:17 GtrmG9
-rw------- 1 apache apache 470 Jan 30 22:30 guD5qi
-rw------- 1 apache apache 776 Jan 29 17:12 guFMMe
-rw------- 1 apache apache 2.1K Feb 3 22:18 gUfya0
-rw------- 1 apache apache 817 Jan 26 00:42 GvnUOq
-rw------- 1 apache apache 2.1K Feb 1 16:55 GvZoPn
-rw------- 1 apache apache 2.0K Jan 25 09:03 gw8Kd4
-rw------- 1 apache apache 817 Jan 27 14:59 gwhcKj
-rw------- 1 apache apache 2.0K Jan 31 22:55 gwMgWN
-rw------- 1 apache apache 776 Jan 26 14:02 gwMnjj
-rw------- 1 apache apache 776 Jan 28 23:23 GxC2wQ
-rw------- 1 apache apache 568 Jan 25 11:08 GxcPeJ
-rw------- 1 apache apache 664 Feb 4 02:09 Gykj5q
-rw------- 1 apache apache 776 Feb 1 11:30 gYokLu
-rw------- 1 apache apache 776 Jan 30 01:51 Gzum7b
-rw------- 1 apache apache 1.7K Feb 1 18:01 h08q3t
-rw------- 1 apache apache 642 Jan 29 00:04 H0r8vO
-rw------- 1 apache apache 2.1K Jan 31 16:45 H0wIXq
-rw------- 1 apache apache 2.0K Jan 28 15:03 h1pTzH
-rw------- 1 apache apache 692 Jan 28 16:34 h2A4Nr
-rw------- 1 apache apache 1.7K Jan 29 22:52 H5Yn0R
-rw------- 1 apache apache 776 Feb 4 02:51 H6ixLJ
-rw------- 1 apache apache 817 Feb 4 02:38 h6L04s
-rw------- 1 apache apache 486 Jan 31 15:51 h83wX7
-rw------- 1 apache apache 2.0K Feb 3 11:58 h8QYen
-rw------- 1 apache apache 470 Jan 28 15:09 h94Iym

It goes on and on and on, and they're filled with junk. Any ideas what's causing this and how to prevent it?

Thanks.

TM