Hacked-together script to enable strict types in PHP files en masse. Primarily intended for PocketMine-MP.

enable_strict_types.php

<?php

declare(strict_types=1);

$startTime = microtime(true);

$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator(__DIR__ . DIRECTORY_SEPARATOR));
foreach($iterator as $file){
	if($file->getExtension() === "php"){
		$path = $file->getPath() . DIRECTORY_SEPARATOR . $file->getFilename();
		if(strpos(file_get_contents($path), "declare(strict_types") !== false){
			continue;
		}

		$lines = file($path);
		$inHeader = false;
		foreach($lines as $lineNum => $line){
			if(strpos($line, "<?php") === 0){
				continue;
			}elseif(strpos($line, "/*") === 0 and !$inHeader){
				$inHeader = true;
				continue;
			}elseif(strpos(trim($line), "*") === 0 and $inHeader){
				continue;
			}elseif(trim($line) === "" and !$inHeader){
				continue;
			}

			if($inHeader and strpos(trim($line), "*/") === 0){
				$inHeader = false;
				continue;
			}

			$start = array_slice($lines, 0, $lineNum);
			$start[] = "\n";
			$start[] = "declare(strict_types=1);\n";
			$end = array_slice($lines, $lineNum);
			$lines = array_merge($start, $end);
			file_put_contents($path, implode("", $lines));
			break;
		}

		echo "Processed " . $path . PHP_EOL;
	}
}

$time = ((microtime(true) - $startTime) * 1000);
echo "Done in " . $time . "ms" . PHP_EOL;