How to Determine File Size of Files Over 2 GB in PHP on x86 Systems?

PHP x86: Determining File Size of Files Exceeding 2 GB without External Programs

In PHP, retrieving the file size of files larger than 2 GB on 32-bit platforms poses a challenge. Standard PHP functions like filesize(), stat(), and fseek() fall short.

To address this, a comprehensive open-source project called Big File Tools emerged. It encompasses ingenious techniques to manage files over 2 GB in PHP, even on 32-bit systems.

One method employed by Big File Tools attempts to leverage platform-specific shell commands. For Windows, it utilizes shell substitution modifiers. For *nix and macOS, it employs the stat command. If these fail, it shifts to COM (specifically for Windows). As a last resort, it reverts to filesize().

Here's a code snippet showcasing how you can determine the file size of a large file using this approach:

<code class="php">function filesize64($file)
{
    $size = null;

    // Try shell command
    if (function_exists('exec') && !ini_get('safe_mode')) {
        $cmd = (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') ? "for %F in (\"$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 Windows COM interface
    if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN' && class_exists("COM")) {
        try {
            $fsobj = new COM('Scripting.FileSystemObject');
            $f = $fsobj->GetFile(realpath($file));
            $size = $f->Size;
        } catch (Exception $e) {}
        if (ctype_digit($size)) {
            return $size;
        }
    }

    // Fall back to filesize()
    return filesize($file);
}</code>

The above is the detailed content of How to Determine File Size of Files Over 2 GB in PHP on x86 Systems?. For more information, please follow other related articles on the PHP Chinese website!