Stackify logs and errors for Apache log4php

1.3.0 2020-11-06 19:36 UTC

This package is not auto-updated.

Last update: 2022-01-15 01:31:13 UTC


PHP version

Stackify log4php Appender

Apache log4php appender for sending log messages and exceptions to Stackify. Apache log4php >= 2.2.0 is supported.


Install the latest version with composer require stackify/log4php

Installation with Linux Agent

This is the suggested installation option, offering the best logging performance.

    <appender_ref ref="stackifyAppender" />

<appender name="stackifyAppender" class="\Stackify\Log\Log4php\Appender">
    <param name="appName" value="application_name" />
    <param name="environmentName" value="environment_name" />

Optional Configuration

Log Server Environment Variables

  • Server environment variables can be added to error log message metadata. Note: This will log all system environment variables; do not enable if sensitive information such as passwords or keys are stored this way.
<param name="logServerVariables" value="true" />

Installation without Linux Agent

This option does not require a Stackify Agent to be installed because it sends data directly to Stackify services. It collects log entries in batches, calls curl using the exec function, and sends data to the background immediately [exec('curl ... &')]. This will affect the performance of your application minimally, but it requires permissions to call exec inside the PHP script and it may cause silent data loss in the event of any network issues. This transport method does not work on Windows. To configure ExecTransport you need to pass the environment name and API key (license key):

    <appender_ref ref="stackifyAppender" />

<appender name="stackifyAppender" class="\Stackify\Log\Log4php\Appender">
    <param name="appName" value="application_name" />
    <param name="environmentName" value="environment_name" />
    <param name="mode" value="exec" />
    <param name="apiKey" value="api_key" />

Optional Configuration


  • ExecTransport supports data delivery through proxy. Specify proxy using libcurl format: <[protocol://][user:password@]proxyhost[:port]>
<param name="proxy" value="" />

Curl path

  • It can be useful to specify curl destination path for ExecTransport. This option is set to 'curl' by default.
<param name="curlPath" value="/usr/bin/curl" />


To get more error details pass Exception objects to the logger if available:

try {
catch (DbException $ex) {
    $logger->error('DB is not available', $ex);

All data added to the MDC or NDC will automatically be captured and attached to your log message. This information will be available as JSON data and will be searchable within Stackify.


If transport does not work, try looking into vendor\stackify\logger\src\Stackify\debug\log.log file (if it is available for writing). Errors are also written to global PHP error_log. Note that ExecTransport does not produce any errors at all, but you can switch it to debug mode:

<param name="debug" value="1" />

Additional Configuration

For additional configurations, you can set on the XML or the PHP File Configuration. Reference for the additional options are located on the stackify logger repository Stackify PHP Logger - Configuration Settings

XML Configuration

  • The string should be a JSON String and HTML Encoded (will improve this eventually.)
// Sample PHP Config
$config = array(
    'Debug' => true,
    'DebugLogPath' => '/path/to/log.log'
// 1. Converting PHP array to JSON String
// - String: {"Debug":true,"DebugLogPath":"/path/to/log.log"}
$jsonString = json_encode($config);
// 2. XML Encode the JSON String
//   - ' is replaced with &apos;
//   - " is replaced with &quot;
//   - & is replaced with &amp;
//   - < is replaced with &lt;
//   - > is replaced with &gt;
// - Encoded String: {&quot;Debug&quot;:true,&quot;DebugLogPath&quot;:&quot;/path/to/log.log&quot;}
// - Note: In case the string has new line ("\n") or a carriage return ("\r") character, you still need to escape it
//   - \n should be replaced with &#10; or &#xA;
//   - \r should be replaced with &#13; or &#xD;
// - Reference:
$xmlEncode = htmlspecialchars($jsonString, ENT_XML1 | ENT_QUOTES, 'UTF-8');

// 3. Add it as a value on XML Configuration
<param name="config" value="{&quot;Debug&quot;:true,&quot;DebugLogPath&quot;:&quot;/path/to/log.log&quot;}" />

PHP Configuration

  • If using the PHP configuration, basically add the config attribute on the params under the Stackify Appender settings
return array(
    'rootLogger' => array(
        'appenders' => array('stackifyAppender'),
    'appenders' => array(
        'stackifyAppender' => array(
            'class' => '\Stackify\Log\Log4php\Appender',
            'params' => array(
                'appName' => 'application-name',
                'environmentName' => 'environment-name',
                // Additional configuration
                'config' => array(
                    'Debug' => true,
                    'DebugLogPath' => 'logConfig.log'


Copyright 2019 Stackify, LLC.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.