I was getting intermittent errors connecting to databases. 
Sometimes it would work fine, sometimes my connect string
would turn to gibberish and sometimes the process would
segfault.

On further examination, in
ext/odbc/php_odbc.c:odbc_sqlconnect(), within the
if(strstr(char *)db,";") block, there is a line
"strcat(ldb,db);".  At this point in the code, ldb was just
emalloced, and had uninitialized contents.  I think strcpy()
is more appopriate here, and changing the code to this seems
to have cleared up my errors.

Thank you very much.