[root@Liz php-3.0.15]# apachectl configtest
Syntax OK
/usr/sbin/apachectl: line 184: 25240 Segmentation fault      (core dumped) $HTTPD -t
[root@Liz php-3.0.15]# gdb /usr/sbin/httpd ./core
GNU gdb 19991116
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 "i586-mandrake-linux"...
Core was generated by `/usr/sbin/httpd -t'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libm.so.6...done.
Reading symbols from /lib/libcrypt.so.1...done.
Reading symbols from /lib/libdb.so.3...done.
Reading symbols from /lib/libnsl.so.1...done.
Reading symbols from /lib/libdl.so.2...done.
Reading symbols from /lib/libc.so.6...done.
Reading symbols from /lib/ld-linux.so.2...done.
Reading symbols from /lib/libnss_files.so.2...done.
#0  0x403a4f54 in ?? ()
(gdb) set args -X
(gdb) bt
#0  0x403a4f54 in ?? ()
#1  0x8088ec4 in clean_parent_exit ()
#2  0x808c129 in main ()
#3  0x400da9ee in __libc_start_main (main=0x808be04 <main>, argc=2,
    argv=0xbffffa64, init=0x8060cf8 <_init>, fini=0x812cc14 <_fini>,
    rtld_fini=0x4000a570 <_dl_fini>, stack_end=0xbffffa5c)
    at ../sysdeps/generic/libc-start.c:90
(gdb) run
Starting program: /usr/sbin/httpd -X
Cannot access memory at address 0x403ad4d4
(gdb) bt
#0  0x4000a611 in _dl_debug_state () at dl-debug.c:57
#1  0x40191790 in _dl_close (map=0x8173ab8) at dl-close.c:195
#2  0x400bf3bb in dlclose_doit (handle=0x8173ab8) at dlclose.c:26
#3  0x4000a30e in _dl_catch_error (errstring=0x400c105c,
    operate=0x400bf3a0 <dlclose_doit>, args=0x8173ab8) at dl-error.c:141
#4  0x400bf91f in _dlerror_run (operate=0x400bf3a0 <dlclose_doit>,
    args=0x8173ab8) at dlerror.c:125
#5  0x400bf38d in dlclose (handle=0x8173ab8) at dlclose.c:32
#6  0x809c456 in ap_os_dso_unload ()
#7  0x8061d89 in unload_module ()
#8  0x807bf91 in run_cleanups ()
#9  0x807a5e3 in ap_clear_pool ()
#10 0x808b83c in standalone_main ()
#11 0x808c1bc in main ()
#12 0x400da9ee in __libc_start_main (main=0x808be04 <main>, argc=2,
    argv=0xbffffa54, init=0x8060cf8 <_init>, fini=0x812cc14 <_fini>,
    rtld_fini=0x4000a570 <_dl_fini>, stack_end=0xbffffa4c)
    at ../sysdeps/generic/libc-start.c:90

Apache 1.3.12 mod_perl 1.21 mod_ssl 2.6.0-1.3.12 (IIRC) 

PHP built using ./configure --with-apxs --with-config-file-path=/etc/httpd/conf/ --with-xml --with-gd --with-mysql --with-zlib.

Apache works just fine with the php module lines commented out in httpd.conf.
See bug 3466 for more fun trying to make PHP work on Mandrake 7.0.