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@ 2015-02-07T07:30:30Z

<?php

/**
 * PHP 5.6 example of "Functional Options" as presented by Rob Pike
 * in his article "Self-referential functions and the design of options"
 * http://commandcenter.blogspot.com.au/2014/01/self-referential-functions-and-design.html
 */

namespace Mailer {
    class Mailer {
        private $host;
        private $lazy = false;

        public function __construct($host, ...$options) {
            $this->host = $host;

            foreach ($options as $option) {
                $option($this);
            }
        }

        // Wish this could be a private function and still be
        // invoked by an options function so it's not mutable from the outside
        public function setLazy($lazy) {
            $this->lazy = $lazy;
        }

        public function isLazy() {
            return $this->lazy;
        }
    }
}
namespace Mailer\Options {
    class Lazy {
        public function __invoke(Mailer $mailer) {
            $mailer->setLazy(true);
        }
    }

    function SuperLazy() {
        return function(\Mailer\Mailer $mailer) {
            $mailer->setLazy(true);
        };
    }
}

namespace {
    use function \Mailer\Options\SuperLazy;

    $tls = function (\Mailer\Mailer $mailer) {
        echo 'LOL Lets do some TLS --';
    };


    // Any one of these $lazy vars can be passed as an option
    $lazy1 = function (\Mailer\Mailer $mailer) {
        $mailer->setLazy(true);
    };
    $lazy2 = new \Mailer\Options\Lazy;
    $lazy3 = SuperLazy(); // Ughhh, I want to do `$lazy3 = SuperLazy;` but PHP won't let me

    $mailer = new \Mailer\Mailer('www.gmail.com', $tls, $lazy3);

    echo $mailer->isLazy() ? 'Yes lazy' : 'No lazy';
}

Output for 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: LOL Lets do some TLS --Yes lazy
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35: Parse error: syntax error, unexpected '.', expecting '&' or variable (T_VARIABLE) in /in/tTreF on line 14
Process exited with code 255.
Output for 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '.', expecting '&' or T_VARIABLE in /in/tTreF on line 14
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_STRING in /in/tTreF on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_STRING in /in/tTreF on line 9
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/tTreF on line 9
Process exited with code 255.

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