切割、合并文件

File.php

<?php

/**
 * Class File
 * @package app\commands
 */
class File
{
    /**
     * @param string $filename
     * @param int $length
     * @return array
     */
    public static function split(string $filename, int $length)
    {
        $parts = [];
        $handle = new \SplFileObject($filename, 'r');
        $index = 0;
        while ($content = $handle->fread($length)) {
            $extension =  '.' . $handle->getExtension();
            $filename = $handle->getPath(). DIRECTORY_SEPARATOR .
                $handle->getBasename($extension) . '-' . $index .
                $extension;
            $f = fopen($filename, 'w+');
            fwrite($f, $content);
            fclose($f);

            $parts[] = [
                'file_path' => $filename,
                'md5' => md5_file($filename),
            ];
            $index++;
        }

        return $parts;
    }

    /**
     * @param string $filename
     * @param mixed ...$fileParts
     * @return array
     */
    public static function merge(string $filename, ...$fileParts)
    {
        $fileHandle = new \SplFileObject($filename, 'w+');
        foreach ($fileParts as $part) {
            $handle = new \SplFileObject($part, 'r');
            //read 256KB
            while ($content = $handle->fread(1024 * 256)) {
                $fileHandle->fwrite($content);
            }
            $handle = null;
        }
        $fileHandle = null;

        return [
            'file_path' => $filename,
            'md5' => md5($filename)
        ];
    }
}