To compile a PECL extension with phpize we usually do:
$ cd extname $ phpize $ ./configure $ make # make install
But this could not work if you have multiple PHP installations on your Ubuntu server (i.e. 5.6, 7.0, 7.1).
To ensure the extension is installed only for a specific version you have to specify
the correct version for the
Example for version 7.0
$ cd extname $ phpize7.0 $ ./configure --with-php-config=/usr/bin/php-config7.0 $ make # make install
In this way the extension will be installed in the correct