This » PECL extension is not bundled with PHP.
Information for installing this PECL extension may be found in the manual chapter titled Installation of PECL extensions. Additional information such as new releases, downloads, source files, maintainer information, and a CHANGELOG, can be located here: » https://pecl.php.net/package/imagick.
Note: The official name of this extension is imagick.
Windows users can download prebuilt DLL from the » PECL website.
These packages already contain the extension DLL (php_imagick.dll)
which needs to be put into the extension_dir.
They also contain the ImageMagick DLLs, which need to be put somewhere in the PATH.
As of Imagick 3.6.0, they also contain XML configuration files in config;
to use these instead of the built-in defaults, they need to put into %USERPROFILE%/.config/ImageMagick,
or alternatively in the path given by the environment variable MAGICK_CONFIGURE_PATH.
Refer to the » ImageMagick configuration files documentation
for further details.