To parse a line from an Apache access log in common format:
<?php
$log = array();
$n = sscanf(trim($line), '%s %s %s [%[^]]] "%s %s %[^"]" %d %s "%[^"]" "%[^"]"',
 $log['ip'],
 $log['client'],
 $log['user'],
 $log['time'],
 $log['method'],
 $log['uri'],
 $log['prot'],
 $log['code'],
 $log['bytes'],
 $log['ref'],
 $log['agent']
);
?>