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

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

范例

Example #1 md5_file() 使用范例

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

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

参见

  • md5() - 计算字符串的 MD5 散列值
  • sha1_file() - 计算文件的 sha1 散列值
  • crc32() - 计算一个字符串的 crc32 多项式

User Contributed Notes

lukasamd at gmail dot com 14-Feb-2012 10:35
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
Chris 08-Nov-2009 07:24
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;
}
?>
smartin 12-Mar-2008 04:58
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)
potsed [at] gmail [dot] com 27-May-2007 04:12
Heres a function to give an md5 for an entire directory..

function MD5_DIR($dir)
{
    if (!is_dir($dir))
    {
        return false;
    }
   
    $filemd5s = array();
    $d = dir($dir);

    while (false !== ($entry = $d->read()))
    {
        if ($entry != '.' && $entry != '..')
        {
             if (is_dir($dir.'/'.$entry))
             {
                 $filemd5s[] = MD5_DIR($dir.'/'.$entry);
             }
             else
             {
                 $filemd5s[] = md5_file($dir.'/'.$entry);
             }
         }
    }
    $d->close();
    return md5(implode('', $filemd5s));
}
richard at interlink dot com dot au 16-Nov-2004 12:57
For those of you with PHP 4 that want to output the "raw" 128 bit hash, all you need to do is send it to pack to convert the hex string into the raw output.

ie:
$filename="checkthisfile.bin";
$rawhash=pack("H*",md5_file($filename));
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