Here's some Perl code to run a PHP script setuid. Just put it into a CGI, make that CGI setuid and executable, then call the CGI where you would usually call the PHP script.
#!/usr/local/bin/perl
# Perl wrapper to execute a PHP script setuid
# ?2002 Simon Kornblith
# Requires PHP CGI
# Make UID = EUID (so that PHP can run system()s and execs() setuid)
$< = $>;
# Set this to the path, so that we can't get poisoned
$ENV{'PATH'} = "/home/httpd/cgi-bin/ssl/admin";
# Open the PHP script (must start with !#/usr/local/bin/php or similar and
# be executable
open(STDOUT, "| /home/httpd/cgi-bin/ssl/admin/new.php");
# Write STDIN to PHP script
print while <STDIN>;
