php: add WIP of PHP

wip/php.md

@@ -0,0 +1,46 @@
+---
+title: PHP
+category: Other
+layout: 2017/sheet
+prism_languages: [php]
+---
+
+### Hello world
+
+#### hello.php
+
+```php
+<?php
+function greetMe($name) {
+  return "Hello, " . $name . "!";
+}
+
+$message = greetMe($name);
+echo $message;
+```
+
+All PHP files start with `<?php`.
+
+See: [PHP tags](http://php.net/manual/en/language.basic-syntax.phptags.php)
+
+### Objects
+
+```php
+<?php
+
+$fruits = array(
+  "apple" => 20,
+  "banana" => 30
+)
+```
+
+### Inspecting objects
+
+```php
+<?php
+var_dump($object)
+```
+
+Prints the contents of a variable for inspection.
+
+See: [var_dump](http://php.net/var_dump)