Add Composer autoloading functions and PHPStan for testing

vendor/nikic/php-parser/lib/PhpParser/Node/Expr/BinaryOp.php

@@ -0,0 +1,40 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Node\Expr;
+
+use PhpParser\Node\Expr;
+
+abstract class BinaryOp extends Expr
+{
+    /** @var Expr The left hand side expression */
+    public $left;
+    /** @var Expr The right hand side expression */
+    public $right;
+
+    /**
+     * Constructs a binary operator node.
+     *
+     * @param Expr  $left       The left hand side expression
+     * @param Expr  $right      The right hand side expression
+     * @param array $attributes Additional attributes
+     */
+    public function __construct(Expr $left, Expr $right, array $attributes = []) {
+        parent::__construct($attributes);
+        $this->left = $left;
+        $this->right = $right;
+    }
+
+    public function getSubNodeNames() : array {
+        return ['left', 'right'];
+    }
+
+    /**
+     * Get the operator sigil for this binary operation.
+     *
+     * In the case there are multiple possible sigils for an operator, this method does not
+     * necessarily return the one used in the parsed code.
+     *
+     * @return string
+     */
+    abstract public function getOperatorSigil() : string;
+}