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Apache log line parser

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I written this code to parse apache log in common log formats. It may have problems with irresponsible formatting like non-concluded into quotes request line. I welcome any modifications to my snippet because it was written if short time and this is my first snippet I publish here. Thanks.

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  1. function parse_access_log_line($format, $line) {
  2.  
  3.   // Get list of consistent patterns
  4.   $patterns = array();
  5.   while($res = preg_match('/(([^%]*)%[^ ]*([a-z]))([^%]*)/i', $format, $matches)) {
  6.     $patterns[$matches[3]] = '('.preg_quote($matches[2]).'(.+?))'.preg_quote($matches[4]);
  7.     // Shift format string
  8.     $format = str_replace($matches[1], '', $format);
  9.   }
  10.  
  11.   // Add beginning of the string to the first pattern and end to the last
  12.   $keys = array_keys($patterns);
  13.   $patterns[$keys[0]] = '^'.$patterns[$keys[0]];
  14.   $patterns[end($keys)] .= '$';
  15.  
  16.   $result = array();
  17.  
  18.   // Consistently apply patterns to the log line shifting it to the right
  19.   foreach ($patterns as $node => $pattern) {
  20.     preg_match('/'.$pattern.'/', $line, $matches);
  21.     $line = str_replace($matches[1], '', $line);
  22.     $result[$node] = $matches[2];
  23.   }
  24.  
  25.   return $result;
  26. }

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