Add php mime type

While PHP files don't have an official mime type adding these in will allow the package to identify various php extensions. The type used is one prefixed with text since PHP files should be human readable, this allows someone to identify a PHP file as plain text.

It's particularly useful to detect and then display the contents of a PHP file in a web app.

Author: mallardduck

src/Dflydev/ApacheMimeTypes/PhpRepository.php

@@ -927,6 +927,13 @@ class PhpRepository implements RepositoryInterface
         'h' => 'text/x-c',
         'hh' => 'text/x-c',
         'dic' => 'text/x-c',
+        'php' => 'text/x-php',
+        'phtml' => 'text/x-php',
+        'php3' => 'text/x-php',
+        'php4' => 'text/x-php',
+        'php5' => 'text/x-php',
+        'php7' => 'text/x-php',
+        'phps' => 'text/x-php',
         'f' => 'text/x-fortran',
         'for' => 'text/x-fortran',
         'f77' => 'text/x-fortran',
@@ -1722,6 +1729,7 @@ class PhpRepository implements RepositoryInterface
         'text/x-java-source' => array('java'),
         'text/x-opml' => array('opml'),
         'text/x-pascal' => array('p', 'pas'),
+        'text/x-php' => array('php', 'phtml', 'php3', 'php4', 'php5', 'php7', 'phps'),
         'text/x-nfo' => array('nfo'),
         'text/x-setext' => array('etx'),
         'text/x-sfv' => array('sfv'),