Auto-fix WordPress stubs <-> PHP 7.3 Polyfill collision

Author: szepeviktor

composer.json

@@ -9,6 +9,7 @@
         "phpstan/phpstan": "^0.11.5"
     },
     "require-dev": {
+        "composer/composer": "^1.8.6",
         "consistence/coding-standard": "^3.8",
         "dealerdirect/phpcodesniffer-composer-installer": "^0.4.4",
         "jakub-onderka/php-parallel-lint": "^1.0",
@@ -28,5 +29,9 @@
         }
     },
     "minimum-stability": "dev",
-    "prefer-stable": true
+    "prefer-stable": true,
+    "scripts": {
+        "post-install-cmd": "PHPStan\\WordPress\\Composer\\FixWpStubs::php73Polyfill",
+        "post-update-cmd": "PHPStan\\WordPress\\Composer\\FixWpStubs::php73Polyfill"
+    }
 }

src/Composer/FixWpStubs.php

@@ -0,0 +1,39 @@
+<?php declare(strict_types = 1);
+/**
+ * Fix WordPress stubs.
+ */
+
+namespace PHPStan\WordPress\Composer;
+
+use Composer\Script\Event;
+
+class FixWpStubs
+{
+	const STUBSFILE = '/giacocorsiglia/wordpress-stubs/wordpress-stubs.php';
+
+	public static function php73Polyfill(Event $event)
+	{
+		if (! class_exists('\Symfony\Polyfill\Php73\Php73')) {
+			return;
+		}
+
+		echo 'Removing duplicate is_countable() ... ';
+		$vendorDir = $event->getComposer()->getConfig()->get('vendor-dir');
+		$stubsFile = $vendorDir . self::STUBSFILE;
+
+		$stubs = file_get_contents($stubsFile);
+		if ($stubs === false) {
+			echo 'WordPress stubs not found.';
+			return;
+		}
+		$fixedStubs = preg_replace('/(\n)(function is_countable)/', '$1// $2', $stubs);
+
+		$numberOfBytes = file_put_contents($stubsFile, $fixedStubs);
+		$message = 'OK.';
+		if ($numberOfBytes === false) {
+			$message = 'FAILED.';
+		}
+
+		echo $message . "\n";
+	}
+}