I am using dbg-cli and, using DebugBreak() in the PHP script, can sporatically get the "run" to work in dbg-cli. Unfortunately, I am unable to see what line is being debugged. I am unable to get "list" to work at all, even if I use "file" to set the source.

Here's a sample session:
dbg>run
Starting program: `/var/www/etc/phpwiki/index.php4'
/etc/phpwiki/index.php4:828 <debugbreak()>
dbg>next
/etc/phpwiki/index.php4:831 </etc/phpwiki/index.php4::main()>
dbg>next
/etc/phpwiki/index.php4:836 </etc/phpwiki/index.s="r::main()>
dbg>list
dbg>file /var/www/etc/phpwiki/index.php4
Reading symbols from /var/www/etc/phpwiki/index.php4...done.
dbg>list
dbg>

Any help is appreciated.

it's a known limitation. "List" command is not supported.
When DDD debugger works though dbg-cli it goes through special code that brings sources from local disk according to mapping settings.

I assume this means that GNU Emacs may work since it interprets gdb output. I'll give it a go.