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1. Add Linux and Zend packages for building the PHP YAML module from PECL sources:

   # yum install gcc autoconf libyaml libyaml-devel php-dev-zend-server

2. IMPORTANT: Add /usr/local/zend/bin to your $PATH, to use Zend Server binaries (PECL, PHP)
3. Run PECL commands. When prompted for libyaml location, click enter for autodetect.

   # pecl channel-update pecl.php.net
   # pecl install yaml

4. Check module dependencies:

   # ldd /usr/local/zend/php/7.3/lib/ext/yaml.so

5. Add ini for loading YAML into PHP:

   # echo "extension=yaml.so" > /usr/local/zend/php/7.3/etc/conf.d/yaml.ini

6. Check PHP module loaded in CLI:

   # php -m | grep yaml

7. Verify that yaml_parse (and other YAML functions) is added:

   # php -r 'print_r(get_extension_funcs("yaml"));'

8. Restart web server to load YAML into your Application PHP.
9. Check YAML functionality in your app (run unit test, load web page etc.).

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