Release Notes for Zend Server 2021

The list below provides the full release notes and changelog for Zend Server 2021.x.

Download Available Now for Linux, Windows, and IBM i

Zend Server 2021.1.0 (September 2021)

  • Fixed Code Tracing that used a conflicting function flag value with PHP 7.4 when marking traceable PHP internal functions causing potential memory leaks. In addition, Code Tracing was including extra PHP internal functions in code traces that were not supposed to be there.
  • Added pdo_odbc extension for IBM i build. This module has a conflict with ibm_db2, pdo_ibm and odbc extensions. Which means that those listed modules MUST be disabled when pdo_odbc is in use or else php will crash due to conflicting symbols from libodbc and libdb400 dynamically loaded system libraries. In addition, to be noted that odbc extension (not pdo_odbc) is heavily modified in Zend Server IBM i build, not functionally equal to ZendPHP (community) variant, adding db2 features and linked to libdb400 library instead of libodbc. This has been like that for long time in Zend Server and we do not change that functionality now to be backwards compatible for customers who may be using odbc extension to communicate with db2 database. ZendPHP does not have such modifications, being functionally different - community variant.
  • ZSD automatically disables ibm_db2, pdo_ibm and odbc extensions when pdo_odbc extension is enabled from GUI. This is true the other way around: when either ibm_db2, pdo_ibm or odbc extension are enabled from GUI pdo_odbc is disabled automatically by ZSD. A NOTICE message is written to zsd.log file when this is done. The functionality is there to avoid PHP crash as explained in the previous bulletin. This functionality can not resolve conflicts when extension .ini files are modified manually in the file system.
  • Fix the functionality to create zendadmin user during automated installation process on IBM i
  • Fix Zend Server directory access permissions on IBM i
  • Improve installation sequence on IBM i. Moved version message initialization logic out from nativelibrary package into zend-server package to avoid errors in nativelibrary install program and to fix version message content in case of ZS upgrades.
  • Improve ZS daemons startup logic, now all processes are in proper IBM "namespaces" after ZS restart from web GUI.
  • Improve nativelib-zendphp74 package installation scripts for upgrades (ZS subsystem stop/(re)start logic).
  • Improve uninstall script for IBM i to avoid uninstalling of ZendPHP when using automated uninstall script for Zend Server
  • Improve IBM i version detection in RepositoryInstaller script.
  • Fix/improve gd extension on linux (PHP 7.1, 7.2, 7.3) and IBM i (PHP 7.2, 7.3) builds to support FreeType formats.
  • Update qt version to 5.12.11 (old 5.12.6)
  • Update PHP versions to,, 7.3.29, 7.4.22
  • Updated libpng from 1.6.32 to1.6.37 on Windows. This eliminates CVE: CVE-2019-7317
  • Fix in IBMi ZS2021.1 installer so that incorrect "INVALID_LICENSE" message would not be generated with side by side install.
  • Fix warnings in log files on Windows platform caused by bad formatting in install-time SQL scripts.
  • Updated Oracle OCI libraries on linux platform. x64 uses now v21.1, ppc64 uses 19.3.
  • Updated sqlsrv version to 5.9.0 for PHP 7.3 and 7.4 on Linux.
  • Updated ibm_db2 extension version to 2.1.3
  • Updated paragonie/random_compat from 2.0.17 to 9.99.99
  • Updated psr/log from 1.0.2 to 1.1.4
  • Updated symfony/polyfill-mbstring from 1.8.0 to 1.23.1
  • Updated zendframework/zend-authentication from 2.6.0 to 2.7.0
  • Updated zendframework/zend-barcode from 2.7.0 to 2.8.0
  • Updated zendframework/zend-cache from 2.8.2 to 2.9.0
  • Updated zendframework/zend-captcha from 2.8.0 to 2.9.0
  • Updated zendframework/zend-code from 3.3.0 to 3.4.1
  • Updated zendframework/zend-component-installer from 2.1.1 to 2.1.2
  • Updated zendframework/zend-console from 2.7.0 to 2.8.0
  • Updated zendframework/zend-crypt from 3.3.0 to 3.3.1
  • Updated zendframework/zend-db from 2.9.3 to 2.11.0
  • Updated zendframework/zend-diactoros from 1.8.2 to 1.8.7
  • Updated zendframework/zend-dom from 2.7.1 to 2.7.2
  • Updated zendframework/zend-escaper from 2.6.0 to 2.6.1
  • Updated zendframework/zend-feed from 2.10.2 to 2.12.0
  • Updated zendframework/zend-file from 2.8.1 to 2.8.3
  • Updated zendframework/zend-filter from 2.8.0 to 2.9.2
  • Updated zendframework/zend-form from 2.12.0 to 2.14.3
  • Updated zendframework/zend-http from 2.8.0 to 2.11.2
  • Updated zendframework/zend-hydrator from 2.4.0 to 2.4.2
  • Updated zendframework/zend-i18n from 2.9.0 to 2.10.1
  • Updated zendframework/zend-i18n-resources from 2.6.0 to 2.6.1
  • Updated zendframework/zend-inputfilter from 2.8.2 to 2.10.1
  • Updated zendframework/zend-json from 3.1.0 to 3.1.2
  • Updated zendframework/zend-json-server from 3.1.0 to 3.2.0
  • Updated zendframework/zend-ldap from 2.10.0 to 2.10.1
  • Updated zendframework/zend-loader from 2.6.0 to 2.6.1
  • Updated zendframework/zend-log from 2.10.0 to 2.12.0
  • Updated zendframework/zend-math from 3.1.1 to 3.2.0
  • Updated zendframework/zend-memory from 2.6.0 to 2.6.1
  • Updated zendframework/zend-mime from 2.7.1 to 2.7.2
  • Updated zendframework/zend-modulemanager from 2.8.2 to 2.8.4
  • Updated zendframework/zend-mvc-i18n from 1.1.0 to 1.1.1
  • Updated zendframework/zend-mvc-plugin-flashmessenger from 1.1.0 to 1.2.0
  • Updated zendframework/zend-mvc-plugin-identity from 1.1.0 to 1.1.1
  • Updated zendframework/zend-mvc-plugin-prg from 1.1.0 to 1.2.0
  • Updated zendframework/zend-navigation from 2.9.0 to 2.9.1
  • Updated zendframework/zend-paginator from 2.8.1 to 2.8.2
  • Updated zendframework/zend-permissions-acl from 2.7.0 to 2.7.1
  • Updated zendframework/zend-progressbar from 2.6.0 to 2.7.0
  • Updated zendframework/zend-router from 3.1.0 to 3.3.0
  • Updated zendframework/zend-serializer from 2.9.0 to 2.9.1
  • Updated zendframework/zend-server from 2.8.0 to 2.8.1
  • Updated zendframework/zend-servicemanager from 3.3.2 to 3.4.0
  • Updated zendframework/zend-servicemanager-di from 1.2.0 to 1.2.1
  • Updated zendframework/zend-session from 2.8.5 to 2.9.1
  • Updated zendframework/zend-soap from 2.7.0 to 2.8.0
  • Updated zendframework/zend-stdlib from 3.2.0 to 3.2.1
  • Updated zendframework/zend-tag from 2.7.0 to 2.7.1
  • Updated zendframework/zend-text from 2.7.0 to 2.7.1
  • Updated zendframework/zend-uri from 2.6.1 to 2.7.1
  • Updated zendframework/zend-validator from 2.10.2 to 2.13.0
  • Updated zendframework/zend-view from 2.10.0 to 2.11.4
  • Updated zendframework/zend-xml2json from 3.1.1 to 3.1.2
  • Updated zendframework/zend-xmlrpc from 2.7.0 to 2.9.0
  • Updated zendframework/zendxml from 1.1.0 to 1.2.0
  • Removed jquery-minicolors

Zend Server 2021 (May 2021)


  • Adds support for PHP 7.4, shipping 7.4.16.
  • New extensions available for Linux: pdo_oci, sqlsrv, and sodium; ffi is available when using PHP 7.4
  • Supported platforms:
    •  CentOS/RHEL 7.7 and 8 (both Linux and Power 8)
    •   Ubuntu 18.04 and 20.04
    •   Debian 9 and 10
    •   IBM i 7.2, 7.3, and 7.4
    •   Windows Server 2016 and 2019
  • Redis extension directives are now available in the Zend Server GUI
  • Implemented the functionality to suspend/resume individual JobQueue queues using API commands suspendQueue() and resumeQueue()
  • Implemented the functionality to suspend/resume multiple JobQueue queues using API commands suspendQueues() and resumeQueues()
  • SELinux additional settings for Power8 and x86 architecture - to fix failures on bootstrap and process restarts
  • Users can now customize the command for restarting the web server via the zend_utils.restart_cmd directive
  • Adds support for configuring the mbstring mbstring.regex_stack_limit setting in the Admin GUI.
  • Adds support for configuring the opcache.preload directive (PHP versions >= 7.2) in the Admin GUI.


  • Updates core dependencies used by Zend Server.
  • Updates ibm_db2 extensions to 2.1.2
  • Updates XDebug to 2.9.8
  • PHPToolkitForIBMi updated to version 1.8.3.
  • ZendServerSDK updated to 1.1.7.
  • ZS WebAPI token-based access is now idempotent.
  • Update Symfony Z-Ray plugin to version 1.0.6.
  • Enhance log messages during Zend Server install: being more specific if Zend Server installation fails or just Web Server configuration fails.

Changes and Removals

  • ZendGlobalDirectives.ini file moves from /etc/conf.d/ to /etc/ directory
  • IBM i: denies access to web.config and .htaccess files by default



  • Updated vhost configuration template for Nginx-based installs so that the proper vhost URL is selectable during both App definition and deployment.
  • PHP extension directives support compatibility and visibility attributes
  • Vhost no longer goes to erroneus "Pending restart" state after app upgrade with hot deployment
  • Fixed applying a new Zend Server license when the previous one was expired
  • Fix bootstrap error message


  • showing error message when log file is not readable
  • timezone detection removed, using configured value


  • Detecting IBM i os400 properly
  • Fix Broken help link in Deploy application popup in IBMi
  • Fixed "ZRay is activated in production profile on IBMi"
  • Power 8 fixes - PHP patch and and improved build options.


  • Fixed ZSD that failed to update the blueprint when discovering new PHP extensions
  • Fixed ZSD that picked up directives from inactive PHP versions when creating the blueprint
  • Fixed ZSD that picked up modified directives from an inactive PHP version
  • Fixed ZSD that failed to start up if there were errors in the zend_extensions_map.json file

Zend Monitor

  • PHP version switch audit trail status message
  • Fixed segfaulting of ZendMonitor extension when privacy filter was being applied to $_SERVER superglobal
  • Fixed Buffer Overflow error in Zend Monitor caused by a large number of socket descriptors


  • Fixed a ZRay crash caused by closures in PHP code
  • Fixed a potential crash in the ZRay caused by an infinite loop when a ZRay extension added storage lines
  • Fixed ZRay that modified an internal PHP structure that it was not supposed to do
  • Fixed ZRay that failed to collect PHP local variables