Installation

This extension may be installed using the bundled
version as of PHP 5.3.0, or as a PECL extension as of PHP 5.2.0. In
other words, there are two methods to install the intl
extension.

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/intl.

Alternatively, –enable-intl will enable
the bundled version while compiling PHP.

If your ICU is installed to a non-standard
directory then you might want to specify its location in
LD_LIBRARY_PATH environment variable
so that dynamic linker can find it:

Otherwise, if PHP and ICU are installed to their
default locations, then the additional options to `configure’ are
not needed.