md5_file

    (PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

    md5_file — 计算指定文件的 MD5 散列值

    说明

    md5_file(string $filename, bool $binary = false): string|false

    使用 » RSA 数据安全公司的 MD5 消息摘要算法 计算 filename 参数指定的文件的 MD5 散列值，并返回该散列值。 该散列值是 32 字符的十六进制数。

    参数

    filename

    文件名

    binary

    为 true 时，返回 16 字符长度的原始二进制格式的摘要。

    返回值

    成功返回字符串，否则返回 false。

    示例

    示例 #1 md5_file() 使用示例

    <?php
    $file     = 'php-5.3.0alpha2-Win32-VC9-x64.zip';

    echo     'MD5 file hash of ' . $file . ': ' . md5_file($file);
    ?>

    参见

    • hash_file() - 给指定文件的内容生成散列值
    • hash_init() - 初始化增量散列运算上下文
    • md5() - 计算字符串的 MD5 散列值

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    用户贡献的备注 3 notes

    up
    100
    Chris
    15 years ago
    If you just need to find out if two files are identical, comparing file hashes can be inefficient, especially on large files. There's no reason to read two whole files and do all the math if the second byte of each file is different. If you don't need to store the hash value for later use, there may not be a need to calculate the hash value just to compare files. This can be much faster:

    <?php
    define    ('READ_LEN', 4096);

    if(    files_identical('file1.txt', 'file2.txt'))
    echo     'files identical';
    else
    echo     'files not identical';

    // pass two file names
    // returns TRUE if files are the same, FALSE otherwise
    function files_identical($fn1, $fn2) {
    if(    filetype($fn1) !== filetype($fn2))
    return     FALSE;

    if(    filesize($fn1) !== filesize($fn2))
    return     FALSE;

    if(!    $fp1 = fopen($fn1, 'rb'))
    return     FALSE;

    if(!    $fp2 = fopen($fn2, 'rb')) {
    fclose($fp1);
    return     FALSE;
    }

    $same = TRUE;
    while (!    feof($fp1) and !feof($fp2))
    if(    fread($fp1, READ_LEN) !== fread($fp2, READ_LEN)) {
    $same = FALSE;
    break;
    }

    if(    feof($fp1) !== feof($fp2))
    $same = FALSE;

    fclose($fp1);
    fclose($fp2);

    return     $same;
    }
    ?>
    up
    9
    lukasamd at gmail dot com
    12 years ago
    It's faster to use md5sum than openssl md5:

    <?php
    $begin     = microtime(true);

    $file_path = '../backup_file1.tar.gz';
    $result = explode(" ", exec("md5sum $file_path"));
    echo     "Hash = ".$result[0]."<br />";

    # Here 7 other big files (20-300 MB)

    $end = microtime(true) - $begin;
    echo     "Time = $end";
    # Time = 4.4475841522217

    #Method with openssl
    # Time = 12.1463856900543
    ?>

    About 3x faster
    up
    -5
    smartin
    16 years ago
    In response to using exec instead for performance (Nov 13 2007 post), It looks like the performance depends on the size of the file. See the results below using the same script from the original post. The first hash is with md5_file and the second is with openssl md5.

    With a 1MB file:
    Hash = df1555ec0c2d7fcad3a03770f9aa238a; time = 0.005006
    Hash = df1555ec0c2d7fcad3a03770f9aa238a; time = 0.01498

    With a 2MB file:

    Hash = 4387904830a4245a8ab767e5937d722c; time = 0.010393
    Hash = 4387904830a4245a8ab767e5937d722c; time = 0.016691

    With a 10MB file:

    Hash = b89f948e98f3a113dc13fdbd3bdb17ef; time = 0.241907
    Hash = b89f948e98f3a113dc13fdbd3bdb17ef; time = 0.037597

    Performance seems to change proportionally with the file size. Judging from the previous post's default file name (.mov) he/she was probably dealing with a large file. These are just quick tests and far from a perfect benchmark, but you might want to test your own files before assuming that the openssl solution is faster (ie, if working with small text files vs. movies, etc)
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