Hi,
ich hab jetzt einige Stunden probiert einen Webserver mit PHP zum laufen zu bekommen.
Hier mein Lösungsweg:

1. Über Cydia "lighttpd SB Settings Toggle" installieren.

2. Per SSH auf das iPhone und über "apt-get install php" oder "aptitude install php" PHP5 installieren

3. Per SSH auf das iPhone und folgende Eingaben durchführen
mkdir /var/log/lighttpd
mkdir /var/www
mkdir /var/run/lighttpd
touch /var/run/lighttpd/php-fastcgi.socket-0
chmod 777 /var/run/lighttpd/php-fastcgi.socket-0

4. Erstellen der lighttpd.conf die dann in /etc abgelegt wird.

lighttpd.conf Achtung: Bei den Configs die man so im Internet findet stimmt der PHP Pfad nicht.
Code:
server.document-root = "/var/www/"
server.port = 80 # Default
server.modules = ( "mod_cgi","mod_indexfile","mod_dirlisting", "mod_accesslog" )
server.tag = "iPhone lighttpd"
server.name = "Aiode.webearth.org"

server.pid-file = "/var/run/lighttpd.pid"
dir-listing.activate = "enable"
dir-listing.external-css = "/.dirlist/iphonedirlist.css"
accesslog.filename = "/var/log/lighttpd/access.log"
server.errorlog = "/var/log/lighttpd/error.log"
 
index-file.names = ( "index.php", "index.py", "index.pl", "index.cgi", "index.html", "default.html", "/.dirlist/dir-generator.py" )
static-file.exclude-extensions = ( ".php", ".pl", ".fcgi", ".cgi", ".py" )
 
cgi.assign = ( ".pl"  => "/usr/bin/perl", ".py" => "/usr/bin/python", ".rb" => "/usr/local/bin/ruby", ".cgi" => "", ".sh" => "", ".php" => "/usr/bin/php-cgi" )
 
mimetype.assign             = (
  ".pdf"          =>      "application/pdf",
  ".sig"          =>      "application/pgp-signature",
  ".spl"          =>      "application/futuresplash",
  ".class"        =>      "application/octet-stream",
  ".ps"           =>      "application/postscript",
  ".torrent"      =>      "application/x-bittorrent",
  ".dvi"          =>      "application/x-dvi",
  ".gz"           =>      "application/x-gzip",
  ".pac"          =>      "application/x-ns-proxy-autoconfig",
  ".swf"          =>      "application/x-shockwave-flash",
  ".tar.gz"       =>      "application/x-tgz",
  ".tgz"          =>      "application/x-tgz",
  ".tar"          =>      "application/x-tar",
  ".zip"          =>      "application/zip",
  ".mp3"          =>      "audio/mpeg",
  ".m3u"          =>      "audio/x-mpegurl",
  ".wma"          =>      "audio/x-ms-wma",
  ".wax"          =>      "audio/x-ms-wax",
  ".ogg"          =>      "application/ogg",
  ".wav"          =>      "audio/x-wav",
  ".gif"          =>      "image/gif",
  ".jpg"          =>      "image/jpeg",
  ".jpeg"         =>      "image/jpeg",
  ".png"          =>      "image/png",
  ".xbm"          =>      "image/x-xbitmap",
  ".xpm"          =>      "image/x-xpixmap",
  ".xwd"          =>      "image/x-xwindowdump",
  ".css"          =>      "text/css",
  ".html"         =>      "text/html",
  ".htm"          =>      "text/html",
  ".js"           =>      "text/javascript",
  ".asc"          =>      "text/plain",
  ".c"            =>      "text/plain",
  ".cpp"          =>      "text/plain",
  ".log"          =>      "text/plain",
  ".conf"         =>      "text/plain",
  ".text"         =>      "text/plain",
  ".txt"          =>      "text/plain",
  ".dtd"          =>      "text/xml",
  ".xml"          =>      "text/xml",
  ".mpeg"         =>      "video/mpeg",
  ".mpg"          =>      "video/mpeg",
  ".mov"          =>      "video/quicktime",
  ".qt"           =>      "video/quicktime",
  ".avi"          =>      "video/x-msvideo",
  ".asf"          =>      "video/x-ms-asf",
  ".asx"          =>      "video/x-ms-asf",
  ".wmv"          =>      "video/x-ms-wmv",
  ".bz2"          =>      "application/x-bzip",
  ".tbz"          =>      "application/x-bzip-compressed-tar",
  ".tar.bz2"      =>      "application/x-bzip-compressed-tar",
  # default mime type
  ""              =>      "application/octet-stream",
)
5. Den Webserver-Dienst jetzt starten mit "lighttpd -f /etc/lighttpd.conf"

größten Teils von Lighttpd mit PHP Funktion auf dem iPhone als WebserverbyVista TuneUp Blog kopiert.

PS: Irgendwie geht bei mir