added php cs fixer

.gitignore

@@ -1,4 +1,5 @@
 .idea
 vendor
 composer.phar
-builds
+builds
+.php-cs-fixer.cache

.php-cs-fixer.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+$finder = PhpCsFixer\Finder::create()
+    ->ignoreDotFiles(false)
+    ->ignoreVCSIgnored(true)
+    ->in(__DIR__)
+    ->exclude('vendor')
+;
+
+$config = new PhpCsFixer\Config();
+$config
+    ->setFinder($finder)
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@PSR12' => true,
+        'strict_param' => true,
+        'array_syntax' => ['syntax' => 'short'],
+    ])
+
+;
+
+return $config;

autoload.php

@@ -3,29 +3,29 @@
 // from https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md
 spl_autoload_register(function ($class) {
 
-	// project-specific namespace prefix
-	$prefix = 'rain1\\ConditionBuilder\\';
+    // project-specific namespace prefix
+    $prefix = 'rain1\\ConditionBuilder\\';
 
-	// base directory for the namespace prefix
-	$base_dir = __DIR__ . '/src/';
+    // base directory for the namespace prefix
+    $base_dir = __DIR__ . '/src/';
 
-	// does the class use the namespace prefix?
-	$len = strlen($prefix);
-	if (strncmp($prefix, $class, $len) !== 0) {
-		// no, move to the next registered autoloader
-		return;
-	}
+    // does the class use the namespace prefix?
+    $len = strlen($prefix);
+    if (strncmp($prefix, $class, $len) !== 0) {
+        // no, move to the next registered autoloader
+        return;
+    }
 
-	// get the relative class name
-	$relative_class = substr($class, $len);
+    // get the relative class name
+    $relative_class = substr($class, $len);
 
-	// replace the namespace prefix with the base directory, replace namespace
-	// separators with directory separators in the relative class name, append
-	// with .php
-	$file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';
+    // replace the namespace prefix with the base directory, replace namespace
+    // separators with directory separators in the relative class name, append
+    // with .php
+    $file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';
 
-	// if the file exists, require it
-	if (file_exists($file)) {
-		require $file;
-	}
-});
+    // if the file exists, require it
+    if (file_exists($file)) {
+        require $file;
+    }
+});

composer.json

@@ -18,10 +18,14 @@
     ]
   },
   "require" : {
-    "php" : ">= 7.0"
+    "php" : ">= 7.4",
+    "ext-json": "*"
   },
   "require-dev": {
     "phpunit/phpunit": "^6.5",
     "satooshi/php-coveralls": "^2.0"
+  },
+  "scripts": {
+    "cs" : "tools/php-cs-fixer/vendor/bin/php-cs-fixer fix"
   }
 }