Simple solution:

1) write a wrapper script (mywrapper.pl):

 use MyCounter; # declare the usage of MyCounter
 
 my $file = shift;
 my $host = shift;
 my $db = <enter dbi opening here>; # where's the DB coming from?
 ...
 $counter = counter( $0, $db, $host ); #i call my module
 print $counter;
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2) call your wrapper script in each PHP file via shell_exec(...):

<?php
 $file = $_SERVER['SCRIPT_FILENAME'];
 $host = $_SERVER['SERVER_ADDR'];
 $output = shell_exec("perl /local/www/nik/mywrapper.pl $file $host");
 echo "<pre>$output</pre>";
?>
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3) DON'T DO THAT. In PHP, write a module as you did in Perl, Include() it and invoke it the same way like you did in Perl. Use mysql_pconnect(...) for persistent database connections (if necessary).

Regards

mwa