help needed with tiger tree hashes

[Carl S. in 't Veld]

I am trying to generate tiger tree hashes the same way as directconnect
does, but I am failing.

I checked the output from php with the reference vectors from
http://www.cs.technion.ac.il/~biham/...sie-format.dat
and they appear to be different!

echo bin2hex(mhash(MHASH_TIGER, 'abc'))."<br/>\n";
outputs
f258c1e88414ab2a527ab541ffc5b8bf935f7b951c132951
instead of
2AAB1484E8C158F2BFB8C5FF41B57A525129131C957B5F93

and, for example,
echo bin2hex(mhash(MHASH_TIGER, 'message digest'))."<br/>\n";
outputs
951a2078cbf881d91c441e754830cf0df6295aa51aca7f51
instead of
D981F8CB78201A950DCF3048751E441C517FCA1AA55A29F6

What am I doing wrong here?

Greetings, Carl in 't Veld