Lookup required PHP version from composer.json

src/Checks/CorrectPhpVersionIsInstalled.php

@@ -2,8 +2,18 @@
 
 namespace BeyondCode\SelfDiagnosis\Checks;
 
+use Illuminate\Filesystem\Filesystem;
+
 class CorrectPhpVersionIsInstalled implements Check
 {
+    /** @var Filesystem */
+    private $filesystem;
+
+    public function __construct(Filesystem $filesystem)
+    {
+        $this->filesystem = $filesystem;
+    }
+
     /**
      * The name of the check.
      *
@@ -17,20 +27,34 @@ public function name(): string
     /**
      * Perform the actual verification of this check.
      *
+     * @throws \Illuminate\Contracts\Filesystem\FileNotFoundException
      * @return bool
      */
     public function check(): bool
     {
-        return version_compare(phpversion(), '7.1.3', '>=');
+        return version_compare(phpversion(), $this->getRequiredPhpVersion(), '>=');
     }
 
     /**
      * The error message to display in case the check does not pass.
      *
+     * @throws \Illuminate\Contracts\Filesystem\FileNotFoundException
      * @return string
      */
     public function message() : string
     {
-        return 'You do not have the required PHP version installed.';
+        return 'You do not have the required PHP version installed.'.PHP_EOL.'Required: '.$this->getRequiredPhpVersion().PHP_EOL.'Used: '.phpversion();
+    }
+
+    /**
+     * @return mixed
+     * @throws \Illuminate\Contracts\Filesystem\FileNotFoundException
+     */
+    public function getRequiredPhpVersion()
+    {
+        $composer = json_decode($this->filesystem->get(base_path('composer.json')), true);
+        $versionString = array_get($composer, 'require.php');
+
+        return str_replace(['^', '~', '<', '>', '='], '', $versionString);
     }
 }

tests/CorrectPhpVersionIsInstalledTest.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace BeyondCode\SelfDiagnosis\Tests;
+
+use Orchestra\Testbench\TestCase;
+use BeyondCode\SelfDiagnosis\Checks\CorrectPhpVersionIsInstalled;
+
+class CorrectPhpVersionIsInstalledTest extends TestCase
+{
+    /** @test */
+    public function it_detects_the_php_version_from_composer_json()
+    {
+        $this->app->setBasePath(__DIR__ . '/fixtures');
+
+        $check = app(CorrectPhpVersionIsInstalled::class);
+
+        $this->assertSame('7.1.3', $check->getRequiredPhpVersion());
+    }
+}

tests/fixtures/composer.json

@@ -0,0 +1,61 @@
+{
+  "name": "laravel/laravel",
+  "description": "The Laravel Framework.",
+  "keywords": [
+    "framework",
+    "laravel"
+  ],
+  "license": "MIT",
+  "type": "project",
+  "require": {
+    "php": "^7.1.3",
+    "fideloper/proxy": "^4.0",
+    "laravel/framework": "5.6.*",
+    "laravel/tinker": "^1.0"
+  },
+  "require-dev": {
+    "filp/whoops": "^2.0",
+    "fzaninotto/faker": "^1.4",
+    "mockery/mockery": "^1.0",
+    "nunomaduro/collision": "^2.0",
+    "phpunit/phpunit": "^7.0"
+  },
+  "autoload": {
+    "classmap": [
+      "database/seeds",
+      "database/factories"
+    ],
+    "psr-4": {
+      "App\\": "app/"
+    }
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "Tests\\": "tests/"
+    }
+  },
+  "extra": {
+    "laravel": {
+      "dont-discover": []
+    }
+  },
+  "scripts": {
+    "post-root-package-install": [
+      "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
+    ],
+    "post-create-project-cmd": [
+      "@php artisan key:generate"
+    ],
+    "post-autoload-dump": [
+      "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
+      "@php artisan package:discover"
+    ]
+  },
+  "config": {
+    "preferred-install": "dist",
+    "sort-packages": true,
+    "optimize-autoloader": true
+  },
+  "minimum-stability": "dev",
+  "prefer-stable": true
+}