function.filesize.32bit.php

<?php
/**
 * Get real file size on 32bit operating system or 32bit PHP
 * @author Ivijan-Stefan Stipic <creativform@gmail.com>
 * @version 1.0.0 BETA
 *
 * @require /class.os.php
 * @return string numeric value of the file size
 **/
function get_filesize($filename)
{
    $buffer     = '';
    $cnt        = 0;
    $chunk_size = 1024 * 1024;
    $filename   = str_replace(array(
        "\\",
        '//'
    ), "/", $filename);

    if (file_exists($filename)):

		if(class_exists('COM')) {
			$fso = new COM("Scripting.FileSystemObject");
			return $fso->GetFile($filename)->Size;
		}

		// First try get via SHELL if is active
        if (OS::is_win()) {
            if (function_exists('shell_exec')) {
                $size = shell_exec('for %F in ("' . $filename . '") do @echo %~zF');
                if (!empty($size)) {
                    $cnt = trim($size);
                }
            }
        } else {
            if (function_exists('shell_exec')) {
                $size = shell_exec('stat -c %s ' . $filename);
                if (!empty($size)) {
                    $cnt = trim($size);
                }
            }
        }

        // SHELL fail in most cases, do PHP magic
        if ($cnt === 0) {
            if (OS::is_php64() !== false && OS::is_os64() !== false) {
                // 64 bit
                $cnt = @filesize($filename);
            } else {
                // 32 bit
                $handle = fopen($filename, 'rb');
                
                if ($handle === false) {
                    return false;
                }
                
                while (!feof($handle)) {
                    $buffer = fread($handle, $chunk_size);
                    if ($buffer !== false) {
                        $cnt += strlen($buffer);
                    }
                }
                
                fclose($handle);
            }
        }

    endif;
    return $cnt;
}