:construction: add a new tex-to-pdf demo(php)

rpc/tutorials/php/.gitignore

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+/composer.lock
+/vendor/
+/lib/
+/config.yml

rpc/tutorials/php/README.md

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+# USAGE
+
+- install [php-pear](https://aur.archlinux.org/packages/php-pear)
+
+```bash
+# add "extension=yaml" to php.ini
+sudo pecl install yaml
+composer update
+```

rpc/tutorials/php/composer.json

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+{
+  "require": {
+    "php-amqplib/php-amqplib": "^3.2",
+    "apache/thrift": "0.20.0",
+    "monolog/monolog": "3.6.0"
+  }
+}

rpc/tutorials/php/config-orig.yml

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+rabbitmq:
+  host: "127.0.0.1"
+  port: 5672
+  user: "guest"
+  password: "guest"
+  virtual-host: "testing"
+
+lily:
+  tex-to-pdf:
+    queue-name: "tex2pdf"
+    callback-url: "http://localhost:8080/md2pdf/callback"

rpc/tutorials/php/lily.php

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+<?php
+
+require_once __DIR__ . '/vendor/autoload.php';
+require_once __DIR__ . '/lib/lily/Tex.php';
+require_once __DIR__ . '/lib/lily/TexToPdfTask.php';
+
+
+use Monolog\Level;
+use Monolog\Logger;
+use Monolog\Handler\StreamHandler;
+use Thrift\Serializer\TBinarySerializer;
+use PhpAmqpLib\Connection\AMQPStreamConnection;
+use PhpAmqpLib\Message\AMQPMessage;
+
+
+use lily\Tex;
+use lily\TexToPdfTask;
+
+function publish_tex_to_pdf($logger, $channel, $queue, $callback)
+{
+    $task = new TexToPdfTask();
+    $task->bucket = "testing";
+    $task->object = date("Y-m-d") . '.pdf';
+    $task->callback = $callback;
+    $task->tex = new Tex();
+    $task->tex->homepage = <<<TEX
+\\documentclass{article}
+
+\\begin{document}
+
+\\title{The title \\thanks{With footnote}}
+\\auhtor{me}
+\\date{\\today}
+\\maketitle
+
+\\include{vocabulary/session-1.tex}
+\\include{vocabulary/session-2.tex}
+\\include{vocabulary/session-3.tex}
+
+\\end {document}
+TEX;
+    $task->tex->files = array(
+        "section-1.tex" => <<<TEX
+\\section{Session 1}
+TEX,
+        "section-2.tex" => <<<TEX
+\\section{Session 2}        
+
+\\First\\footnote{First note}
+\\Second\\footnote{Second note}
+\\Third\\footnote{Third note}
+TEX,
+        "section-3.tex" => <<<TEX
+\\section{Session 3}
+TEX,
+    );
+
+    $body = TBinarySerializer::serialize($task);
+    $message_id = uniqid();
+    $logger->debug("publish a tex-to-pdf task(" . strlen($body)  . "bytes) " . $message_id);
+    // https://github.com/php-amqplib/php-amqplib/blob/master/doc/AMQPMessage.md
+    $message = new AMQPMessage($body, ['message_id' => $message_id]);
+    $channel->basic_publish($message, '', $queue);
+}
+
+$logger = new Logger('lily');
+$logger->pushHandler(new StreamHandler('php://stdout', Level::Debug));
+$logger->debug("run on debug mode");
+
+if ($argc !== 2) {
+    $logger->error("usage: php $argv[0] config.yml");
+    exit(1);
+}
+$logger->debug("$argc");
+$logger->info("load config from" . $argv[1]);
+$config = yaml_parse_file($argv[1]);
+$logger->debug("connect to rabbitmq://" . $config['rabbitmq']['host'] . "@" . $config['rabbitmq']['host'] . ":" . $config['rabbitmq']['port'] . "/" . $config['rabbitmq']['virtual-host']);
+
+$queue_connection = new AMQPStreamConnection($config['rabbitmq']['host'], $config['rabbitmq']['port'], $config['rabbitmq']['user'], $config['rabbitmq']['password'], $config['rabbitmq']['virtual-host']);
+$queue_channel = $queue_connection->channel();
+
+
+publish_tex_to_pdf($logger, $queue_channel, $config['lily']['tex-to-pdf']['queue-name'], $config['lily']['tex-to-pdf']['callback-url']);
+
+
+$queue_channel->close();
+$queue_connection->close();
+$logger->warning("quit.");