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                            ~~~
//獲取文件的大小
function getfilesize($file) {
    $perms = stat($file);
    $size = $perms['size'];
    // 單位自動轉換函數
    $kb = 1024;         // Kilobyte
    $mb = 1024 * $kb;   // Megabyte
    $gb = 1024 * $mb;   // Gigabyte
    $tb = 1024 * $gb;   // Terabyte

    if ($size < $kb) {
        return $size . " B";
    } else if ($size < $mb) {
        return round($size / $kb, 2) . " KB";
    } else if ($size < $gb) {
        return round($size / $mb, 2) . " MB";
    } else if ($size < $tb) {
        return round($size / $gb, 2) . " GB";
    } else {
        return round($size / $tb, 2) . " TB";
    }
}

filesize(filename)直接獲取文件字節數
~~~

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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