Add Safe PHP functions

vendor/thecodingmachine/safe/CONTRIBUTING.md

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+# Contributing
+
+Safe-PHP code is generated automatically from the PHP doc.
+
+## How to install Safe-PHP development environment
+
+The first step is to download the PHP documentation project locally.
+You will need Subversion (svn) installed on your computer.
+
+```bash
+$ cd generator/doc
+$ svn co https://svn.php.net/repository/phpdoc/modules/doc-en doc-en
+$ cd ../..
+```
+
+At any point, if you want to update the documentation to the latest version, you can use:
+
+```bash
+$ cd generator/doc/doc-en
+$ svn update
+```
+
+### Generating the functions
+
+Generating the functions can be done with a simple command.
+
+```bash
+$ cd generator
+$ php ./safe.php generate
+```
+
+### Submitting a PR
+
+The continuous integration hooks will regenerate all the functions and check that the result is exactly what has been
+committed. Therefore, before submitting a PR, please:
+
+- Perform a "svn update"
+- Regenerate the files using `php ./safe.php generate`