Linux = RedHat 6.0 + RPM updates (kernel = 2.2.5-15)
Oracle = Oracle 8i Enterprise Edition (+ patch !) for Linux - free download
Oracle version = version 8.1.5_01
Apache = 1.3.9
PHP4 = beta 2

I compiled PHP4b2 statically into Apache 1.3.9 from the tarballs.
The PHP modules (Oracle, gd...) were compiled statically into the PHP.

I am using the "free download" Oracle 8i Enterprise Edition (ver 8.1 with 8.1.5_01 patch)
I believe this version of Oracle was misidentified as Oracle 8.0 - see bug report #2536

This bug is basically the same as bug report #2527 (against PHP3), which I filed last night.
I attempted to use PHP4 to see if the bug had been resolved in this release.  It has not.

Here's the backtrace:
-----------------------
[root@cr309449-a bin]# gdb httpd
GNU gdb 4.17.0.11 with Linux support
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux"...
(gdb) run -X
Starting program: /www/bin/httpd -X

Program received signal SIGTRAP, Trace/breakpoint trap.
0x813e1ad in gdFontTiny ()
(gdb) bt
#0  0x813e1ad in gdFontTiny ()
#1  0x8081109 in php3_Ora_Do_Logon (ht=2, return_value=0xbffff914, 
    list=0x8151620, plist=0x815164c, this_ptr=0x0, persistent=0)
    at oracle.c:496
#2  0x8080eed in php3_ora_logon (ht=2, return_value=0xbffff914, 
    list=0x8151620, plist=0x815164c, this_ptr=0x0) at oracle.c:408
#3  0x80b5b6c in execute (op_array=0x8190a30) at zend_execute.c:1407
#4  0x80749e0 in php_execute_script (primary_file=0xbffffba4) at main.c:1138
#5  0x8074a59 in apache_php_module_main (r=0x818adac, fd=19, 
    display_source_mode=0) at main.c:1180
#6  0x8073343 in send_php ()
#7  0x8073388 in send_parsed_php ()
#8  0x80bbfd3 in ap_invoke_handler ()
#9  0x80cf2c9 in process_request_internal ()
#10 0x80cf32c in ap_process_request ()
#11 0x80c6cee in child_main ()
#12 0x80c6e7c in make_child ()
#13 0x80c6fd9 in startup_children ()
#14 0x80c7606 in standalone_main ()
#15 0x80c7d83 in main ()
#16 0x40637cb3 in __libc_start_main (main=0x80c7a4c <main>, argc=2, 
    argv=0xbffffd54, init=0x805b6bc <_init>, fini=0x810033c <_fini>, 
    rtld_fini=0x4000a350 <_dl_fini>, stack_end=0xbffffd4c)
    at ../sysdeps/generic/libc-start.c:78
(gdb) 

Here's the script which causes failure:
 --------------------------------------------
Trying to connect to Oracle<BR>
<?
 putenv("LD_LIBRARY_PATH=/home/OraHome1/lib");
 putenv("ORACLE_HOME=/home/OraHome1");
 putenv("ORACLE_SID=TS01");

 $conn = ora_logon("reader", "reader");
 if ($conn) {
   print("connected !<BR>\n");
   ora_logoff($conn);
 } else {
   print("not connected<BR>\n");
 }
?>

(Note: even the first line of text is not flushed out to the browser)

Here is the configure line I used for PHP:
-----------------------------------------------
./configure --with-apache=../apache_1.3.9 --with-gd --with-ttf --with-oci8 --with-oracle --enable-track-vars