How to Determine File Size of Files Larger Than 2 GB in PHP Without Using External Tools?

Getting File Size of > 2 GB Files in PHP Without External Programs

The default methods of determining file size, such as filesize(), stat(), and fseek(), fail to accurately capture the size of files exceeding 2 GB. However, a viable solution exists within PHP 32-bit platforms utilizing the open-source project, Big File Tools.

Big File Tools: A Comprehensive Solution

Big File Tools encompasses a range of techniques specifically designed to manipulate files greater than 2 GB. This platform-independent library offers a robust approach, initially attempting to leverage system-specific shell commands. In scenarios where shell commands are unavailable, it employs Windows COM or resorts to filesize().

Implementing the Solution

The following PHP code showcases how to implement the Big File Tools solution:

<code class="php">/*
 * This software may be modified and distributed under the terms
 * of the MIT license.
 */

function filesize64($file)
{
    static $iswin;
    if (!isset($iswin)) {
        $iswin = (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN');
    }

    static $exec_works;
    if (!isset($exec_works)) {
        $exec_works = (function_exists('exec') && !ini_get('safe_mode') && @exec('echo EXEC') == 'EXEC');
    }

    // try a shell command
    if ($exec_works) {
        $cmd = ($iswin) ? "for %F in (\"$file\") do @echo %~zF" : "stat -c%s \"$file\"";
        @exec($cmd, $output);
        if (is_array($output) && ctype_digit($size = trim(implode("\n", $output)))) {
            return $size;
        }
    }

    // try the Windows COM interface
    if ($iswin && class_exists("COM")) {
        try {
            $fsobj = new COM('Scripting.FileSystemObject');
            $f = $fsobj->GetFile( realpath($file) );
            $size = $f->Size;
        } catch (Exception $e) {
            $size = null;
        }
        if (ctype_digit($size)) {
            return $size;
        }
    }

    // if all else fails
    return filesize($file);
}</code>

This implementation ensures accurate file size determination for files exceeding 2 GB without the need for external programs.

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