Fix the version used in the PHAR (#259)

Closes #257

.gitignore

@@ -8,6 +8,7 @@
 /fixtures/set004/scoper.inc.php
 /fixtures/*/.box_dump/
 /fixtures/*/vendor/
+.phpunit*
 /vendor/
 /vendor-bin/*/vendor/
 /vendor-bin/*/bin/

box.json.dist

@@ -7,6 +7,7 @@
     "files": [
         "src/scoper.inc.php.tpl"
     ],
+    "git": "git_version_placeholder",
 
     "compression": "GZ",
 

src/functions.php

@@ -66,9 +66,13 @@ function create_application(): SymfonyApplication
  */
 function get_version(): string
 {
+    if ('phar:' === substr(__FILE__, 0, 5)) {
+        return '@git_version_placeholder@';
+    }
+
     $rawVersion = Versions::getVersion('humbug/php-scoper');
 
-    list($prettyVersion, $commitHash) = explode('@', $rawVersion);
+    [$prettyVersion, $commitHash] = explode('@', $rawVersion);
 
     return (1 === preg_match('/9{7}/', $prettyVersion)) ? $commitHash : $prettyVersion;
 }