PHP library to parse Apache log files

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0.2.0 2020-12-02 12:44 UTC

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Last update: 2023-09-14 01:24:29 UTC


A PHP library to parse Apache logs.

Build Status Coverage Status Latest Stable Version License


This library is installable via Composer. Just run:

composer require benmorel/apache-log-parser


This library requires PHP 7.1 or later.

Project status & release process

This library is under development.

The current releases are numbered 0.x.y. When a non-breaking change is introduced (adding new methods, optimizing existing code, etc.), y is incremented.

When a breaking change is introduced, a new 0.x version cycle is always started.

It is therefore safe to lock your project to a given release cycle, such as 0.1.*.

If you need to upgrade to a newer release cycle, check the release history for a list of changes introduced by each further 0.x.0 version.

Package contents

This library provides a single class, Parser.

Quick start

First construct a Parser object with the LogFormat defined in the httpd.conf file of the server that generated the log file:

use BenMorel\ApacheLogParser\Parser;

$logFormat = "%h %l %u %t \"%{Host}i\" \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"";
$parser = new Parser($logFormat);

The library converts every format string of your log format to a field name; the list of fields can be accessed through the getFieldNames() method:

array (
  0 => 'remoteHostname',
  1 => 'remoteLogname',
  2 => 'remoteUser',
  3 => 'time',
  4 => 'requestHeader:Host',
  5 => 'firstRequestLine',
  6 => 'status',
  7 => 'responseSize',
  8 => 'requestHeader:Referer',
  9 => 'requestHeader:User-Agent',

You're then ready to parse a single line of your log file: the parse() method accepts the log line, and a boolean to indicate whether you want the results as a numeric array, whose keys match the ones of the field names array:

$line = ' - - [30/May/2018:15:00:23 +0200] "" "GET / HTTP/1.0" 200 1234 "-" "Mozilla/5.0';

    $parser->parse($line, false)
array (
  0 => '',
  1 => '-',
  2 => '-',
  3 => '30/May/2018:15:00:23 +0200',
  4 => '',
  5 => 'GET / HTTP/1.0',
  6 => '200',
  7 => '1234',
  8 => '-',
  9 => 'Mozilla/5.0',

Or as an associative array, with the field names as keys:

    $parser->parse($line, true)
array (
  'remoteHostname'           => '',
  'remoteLogname'            => '-',
  'remoteUser'               => '-',
  'time'                     => '30/May/2018:15:00:23 +0200',
  'requestHeader:Host'       => '',
  'firstRequestLine'         => 'GET / HTTP/1.0',
  'status'                   => '200',
  'responseSize'             => '1234',
  'requestHeader:Referer'    => '-',
  'requestHeader:User-Agent' => 'Mozilla/5.0',

If a line cannot be parsed, an InvalidArgumentException is thrown. Be sure to wrap your parse() calls in a try-catch block:

try {
    $parser->parse($line, true)
} catch (\InvalidArgumentException $e) {
    // ...

Field names returned by the library

This table shows how format strings are mapped to field names by the library:

Format string Field name
%a clientIp
%{c}a clientIp:c
%A localIp
%B responseSize
%b responseSize
%D responseTime
%f filename
%h remoteHostname
%H requestProtocol
%{VARNAME}i requestHeader:VARNAME
%k keepaliveRequests
%l remoteLogname
%L requestLogId
%m requestMethod
%{VARNAME}o responseHeader:VARNAME
%p canonicalPort
%{FORMAT}p canonicalPort:FORMAT
%P processId
%q queryString
%r firstRequestLine
%R handler
%s status
%t time
%T timeToServe
%{UNIT}T timeToServe:UNIT
%u remoteUser
%U urlPath
%v serverName
%V serverName
%X connectionStatus
%I bytesReceived
%O bytesSent
%S bytesTransferred
%{VARNAME}^ti requestTrailerLine:VARNAME
%{VARNAME}^to responseTrailerLine:VARNAME

If two or more format strings yield the same field name, the second one will get a :2 suffix, the third one a :3 suffix, etc.

Performance notes

You can expect to parse more than 250,000 records per second (> 50 MiB/s) when reading logs from a file on a modern server with an SSD drive.

Returning records as an associative array comes with a small performance penalty of about 6%.