Require ext-chunkutils2 at ^0.2.0

src/PocketMine.php

@@ -33,6 +33,12 @@ namespace pocketmine {
 	use pocketmine\utils\Terminal;
 	use pocketmine\utils\Timezone;
 	use pocketmine\wizard\SetupWizard;
+	use function extension_loaded;
+	use function phpversion;
+	use function preg_match;
+	use function preg_quote;
+	use function strpos;
+	use function version_compare;
 
 	require_once __DIR__ . '/VersionInfo.php';
 
@@ -121,6 +127,16 @@ namespace pocketmine {
 			}
 		}
 
+		$chunkutils2_version = phpversion("chunkutils2");
+		$wantedVersionLock = "0.2";
+		$wantedVersionMin = "$wantedVersionLock.0";
+		if($chunkutils2_version !== false && (
+			version_compare($chunkutils2_version, $wantedVersionMin) < 0 ||
+			preg_match("/^" . preg_quote($wantedVersionLock, "/") . "\.\d+$/", $chunkutils2_version) === 0 //lock in at ^0.2, optionally at a patch release
+		)){
+			$messages[] = "chunkutils2 ^$wantedVersionMin is required, while you have $chunkutils2_version.";
+		}
+
 		if(extension_loaded("pocketmine")){
 			$messages[] = "The native PocketMine extension is no longer supported.";
 		}