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If PHP reports Class ZipArchive not found, says the ZIP extension is missing, or Composer cannot find a ZIP extension or an unzip/7z utility, fix the PHP runtime that actually runs the failing command or website. First identify that runtime and its loaded php.ini; then install or enable ZIP, restart the relevant service, and verify both the module and the ZipArchive class.
What the ZipArchive error means
PHP’s ZIP extension provides transparent reading and writing of ZIP archives and exposes the ZipArchive class. The error does not usually mean that a particular archive is corrupt. It means the PHP process executing your code has not loaded the ZIP extension, or that PHP tried and failed to load its binary dependencies.
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The same computer can have several independent PHP runtimes. Command-line PHP, Apache’s PHP module, PHP-FPM, a container, and a hosting-control-panel version may each use a different executable, version, architecture, or php.ini. Enabling ZIP for one does not automatically enable it for the others.
Identify the runtime that is failing
Do this before editing configuration. A change made to the wrong PHP installation has no effect and can make troubleshooting confusing.
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CLI checks
- Run the command in the same shell, virtual environment, container, or deployment job that reports the error.
- Record the version and build details with
php -v. - Find the configuration files used by that executable with
php --ini. Note the line labelled Loaded Configuration File and the additional scan directory. - Check whether ZIP is listed with
php -m. On Windows you can filter the result withphp -m | findstr /i zip; on Unix-like systems usephp -m | grep -i '^zip$'. - Check the class directly with
php -r "var_dump(class_exists('ZipArchive'));". A result ofbool(true)confirms that the executing CLI process can use the class.
Keep the PHP version, 32-bit or 64-bit architecture, thread-safety mode on Windows, executable path, and loaded configuration path. Those details determine which package or DLL is compatible.
Web-server checks
CLI output does not prove that a website uses the same PHP. Create a temporary file in the document root containing <?php phpinfo(); ?>, open it through the affected site, and inspect:
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- Loaded Configuration File, which is the
php.iniused by the web request. - extension_dir, the directory from which PHP loads extensions.
- A zip section, which appears when the extension is loaded.
Delete the diagnostic file immediately after checking it. A public phpinfo() page exposes configuration and build information that should not remain available.
Containers, FPM and managed hosting
For PHP-FPM, inspect the FPM pool or container image rather than assuming the host’s CLI PHP is relevant. Restart the FPM service or recreate the container after changing packages or configuration. In managed hosting, you may be unable to edit php.ini, install modules, or restart PHP. In that case ask the provider to enable ZIP for the specific web PHP version, or use a plan and deployment environment where you control extensions.
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Fix ZIP on Windows
PHP 8.2 and newer: enable the DLL explicitly
PHP’s ZIP installation manual changed the requirement in PHP 8.2.0: php_zip.dll must be enabled in php.ini; earlier Windows builds had ZIP built in. Therefore a PHP upgrade can expose this error even when the application and archive have not changed.
- Use the failing runtime’s
php --ini, or the web runtime’sphpinfo(), to locate the activephp.ini. - Open that file with an administrator-capable editor if necessary. Do not edit a sample file or a different PHP installation.
- Confirm that the extension directory contains
php_zip.dll. The normal location is the PHP installation’sextdirectory. - Enable the extension. Depending on the installed configuration, the directive may be
extension=zipor an equivalent DLL directive such asextension=php_zip.dll. Ensure the line is not commented out with a leading semicolon. - Save the file and restart the service that loads PHP: Apache, IIS, or the applicable PHP-FPM process. Restarting a terminal does not reload an already running web worker.
- Reopen
phpinfo()through the website and confirm that a ZIP section is present. For CLI, rerunphp -mand theclass_existscheck.
Resolve an Unable to load dynamic library warning
If PHP prints a startup warning about php_zip.dll, the directive is being read but the DLL cannot be loaded. The Windows extension guidance identifies three frequent causes:
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extension_dirpoints somewhere that does not contain the DLL. - Missing dependent DLLs: the ZIP extension or PHP itself requires runtime libraries that are absent from the process’s search path.
- Build mismatch: the extension does not match the PHP major/minor version, CPU architecture, or thread-safety setting.
Check the exact path and error text in the CLI startup output and PHP or web-server logs. Make sure the DLL came from a build intended for the same PHP version and for the same x86/x64 and thread-safe (TS) or non-thread-safe (NTS) mode. Do not copy a DLL from an unrelated PHP installation. Correct the path or install the matching PHP distribution, restart the service, and test again.
Fix ZIP on Linux
Use a distribution package
Most Linux distributions provide a PHP ZIP package, often named php-zip or a versioned equivalent. The package name and command vary by distribution and PHP version, so select the package from the repository that supplies the PHP executable used by your application. Installing a package for a different PHP stream can leave the web server and CLI on different module sets.
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- Identify the runtime with
php -v,php --ini, and your web server’sphpinfo()page. - Use your distribution’s package manager to install its ZIP module for that exact PHP stream. Confirm that the package is enabled rather than merely downloaded.
- Restart the PHP handler used by the site, such as the matching PHP-FPM service, or restart Apache when PHP is loaded as an Apache module.
- Verify with
php -mfor CLI and with the web runtime’sphpinfo()page. Testclass_exists('ZipArchive')in the same context as the application.
Do not paste a command intended for Debian/Ubuntu, a DNF-based system, Alpine, Arch, or macOS into another operating system. Repository naming, service names, and supported PHP versions differ.
Build PHP from source
A source build must include ZIP support. PHP’s build documentation specifies --with-zip. For PHP 7.4 and later, a system libzip can be selected with --with-libzip=DIR. The manual requires libzip 0.11 or newer and recommends 0.11.2 or later.
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- Install a compatible libzip development package, or make an appropriate libzip installation available at a known directory.
- Configure PHP with
--with-zipand, when needed,--with-libzip=DIR. - Build and install PHP using the same prefix and service integration as the existing runtime.
- Confirm that the rebuilt executable and the web handler are actually selected. A successful build does not switch an existing FPM pool or Apache module automatically.
- Restart the handler and verify the ZIP module and
ZipArchiveclass.
If configuration reports that libzip is missing, the build environment lacks the required development files or PHP is looking in the wrong directory. Install a compatible development package or point --with-libzip at the correct location, then rerun configuration.
PECL, packaged builds and containers
PECL builds
The PHP ZIP installation documentation points to PECL for extension installation, and PECL publishes ZIP builds for Windows. Choose a build matching the running PHP version, architecture, and thread-safety mode. After installation, enable it in the active configuration, restart the relevant service, and verify in that runtime. A PECL module installed for CLI PHP will not repair a website that uses another PHP installation.
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Container images
Install ZIP in the image build rather than making an undocumented change inside a running container. Rebuild and redeploy the image, then run the diagnostic commands inside the container and make a request through the deployed web service. Ensure the PHP binary used by the application is the one whose image layer contains the extension.
Composer says ZIP and unzip or 7z are missing
Composer can report two separate capabilities: PHP’s ZIP extension and an external archive utility such as unzip or 7z. The first is fixed by loading the PHP ZIP extension in Composer’s own runtime. The second requires an executable installed in the operating system environment available to Composer.
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- Run Composer from the same account, shell, container, or deployment job that fails.
- Check which PHP Composer invokes and inspect that runtime’s module list and
php.ini. - Enable or install ZIP for that PHP runtime, restart any persistent worker, and rerun the Composer command.
- If Composer still requests
unzipor7z, install one of those utilities through the operating system’s supported package source, or use an environment where one is already available. Confirm that it is on the executing process’sPATH. - Run the original install or update again. Do not treat the presence of ZIP in your web server’s
phpinfo()page as proof that the Composer process can see it.
Verify the repair end to end
A module-list check is necessary but not sufficient. Verify the exact operation that previously failed.
- For CLI applications, run
php -m, thenphp -r "var_dump(class_exists('ZipArchive'));", and rerun the failed command. - For websites, confirm the ZIP section in the web runtime’s
phpinfo()output, remove the diagnostic page, and repeat the request that produced the error. - For PHP-FPM, restart the pool or service after configuration changes and verify through an actual HTTP request.
- For Composer, rerun the same install, update, or framework command under the same user and environment.
- If the application still fails, log the PHP version, executable or handler, loaded configuration path,
extension_dir, and the exact startup warning. These identify whether the remaining problem is selection, loading, or application-level behavior.
Troubleshooting matrix
| Symptom | Likely cause | Action |
|---|---|---|
Class ZipArchive not found |
ZIP is not loaded in the executing runtime. | Find that runtime’s php.ini, install or enable ZIP, restart its handler, and verify the class. |
php -m shows zip, but the website still fails |
CLI and web PHP use different binaries or configuration files. | Inspect the website with phpinfo() and change the web runtime, not only CLI PHP. |
Windows startup warning for php_zip.dll |
Incorrect extension_dir, missing dependency DLL, or PHP/DLL build mismatch. |
Read startup and server logs; check the DLL location, dependent libraries, version, architecture, and TS/NTS mode. |
| Linux build says libzip is missing | The required libzip development files are unavailable or not in the searched directory. | Install a compatible system libzip or use --with-libzip=DIR, then rebuild with --with-zip. |
| Shared hosting prevents configuration changes | Your account cannot install or enable PHP modules. | Ask the provider to enable ZIP for the site’s web PHP version or move to an environment with extension control. |
Composer still mentions unzip or 7z |
The external utility is absent or unavailable on the process PATH. |
Install an approved utility in that operating-system environment and rerun Composer under the same user. |
Choose the remedy by environment
| Environment | Typical remedy | Who must act |
|---|---|---|
| Windows PHP 8.2 or newer | Enable php_zip.dll in the active php.ini, resolve any DLL dependency error, and restart the service. |
Administrator or developer controlling that PHP installation. |
| Linux packaged PHP | Install the ZIP package for the exact PHP stream and restart the matching handler. | System administrator or deployment pipeline. |
| Linux source build | Provide compatible libzip and rebuild PHP with --with-zip. |
Build and infrastructure owner. |
| PECL or custom module | Install a module matching PHP version, architecture, and thread-safety mode, then enable and restart. | Administrator controlling the runtime. |
| Container | Add ZIP and any archive utility to the image, rebuild, redeploy, and verify inside the running container. | Image and deployment maintainer. |
| Managed hosting | Request ZIP for the specific web PHP version or change to an account with module control. | Hosting provider or account administrator. |
Common mistakes to avoid
- Editing
php.ini-developmentorphp.ini-productioninstead of the file shown as loaded. - Checking only
php -mwhen the failure occurs in a browser request, queue worker, or Composer job. - Installing a DLL built for another PHP minor version, architecture, or TS/NTS mode.
- Changing configuration without restarting Apache, IIS, PHP-FPM, or the container process that cached it.
- Leaving a public
phpinfo()file online after testing. - Assuming the ZIP extension supplies the operating-system
unzipor7zcommand required by some Composer workflows.
Frequently asked questions
Can application code enable ZipArchive?
No. The extension must be installed and loaded by the PHP runtime before application code starts. A script can detect its absence, but it cannot replace the server-level module installation.
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Why did the error appear immediately after upgrading PHP?
On Windows, PHP 8.2 and newer requires explicit enabling of php_zip.dll, whereas earlier versions treated ZIP as built in. An upgrade can therefore require a new php.ini entry and service restart.
Do I need both the ZIP extension and unzip?
They are different components. PHP code that calls ZipArchive needs the ZIP extension. A Composer workflow may additionally use an external unzip or 7z executable, depending on what is available in its environment.
What if I cannot restart the web server?
A configuration edit will not affect already running workers until the PHP handler reloads. Ask the administrator or hosting provider to restart the relevant service; on a container platform, deploy a rebuilt image.

