Create Twig 1 Hello World benchmark

.gitignore

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+.idea/
+vendor/

README.md

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+<p align="center">
+  <img src="http://www.phpbenchmarks.com/images/logo_github.png">
+  <br>
+  <a href="http://www.phpbenchmarks.com" target="_blank">www.phpbenchmarks.com</a>
+</p>
+
+## What is www.phpbenchmarks.com ?
+
+You will find lot of benchmarks for PHP frameworks and template engines.
+
+You can compare results between Apache Bench and Siege, and PHP 5.6 to 7.2.
+
+## What is this repository ?
+
+It's benchmark common code for Twig benchmarks.
+
+Switch branch to select your Twig major version and benchmark you want to see.
+
+See all Twig benchmarked versions on [phpbenchmarks/twig](https://github.com/phpbenchmarks/twig).
+
+You can find how we benchmark on [phpbenchmarks.com](http://www.phpbenchmarks.com/en/benchmark-protocol.html).
+
+## How versions works ?
+
+We do not follow semantic version for this repository. Here is an explanation about our versioning system:
+
+`X` related to Twig major version (`1` Twig ^1, `2` Twig ^2)
+
+`Y` benchmark type (`1` Hello World)
+
+`Z` new version, not just bugfix and could contains BC
+
+## Benchmarks
+
+You can find all Twig benchmarks results on [phpbenchmarks.com](http://www.phpbenchmarks.com/en/benchmark/twig.html).
+
+Scores are too low ? Do not hesitate to create a pull request, and ask a new benchmark !

composer.json

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+{
+    "name": "phpbenchmarks/twig-common",
+    "type": "project",
+    "license": "proprietary",
+    "require": {
+        "twig/twig": "^1.0"
+    }
+}

helloworld.php

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+<?php
+
+$twig = new Twig_Environment(
+    new Twig_Loader_Filesystem(__DIR__ . '/templates'),
+    ['cache' => $cacheDir]
+);
+
+$twig->display('helloworld.html.twig');

templates/helloworld.html.twig

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+Hello World !