如何使用PHP计算文件的MD5值

function getAllFileMd5($dir){

$hash = ''

$dir = new RecursiveDirectoryIterator($dir)

foreach(new RecursiveIteratorIterator($dir) as $file) {

$hash .= md5_file($file)

}

return md5($hash)

}

?>

function file_read_all ($dir)

{

if (is_dir($dir)) {

if ($dh = opendir($dir)) {

$n=0

while (($file = readdir($dh)) !== false) {

if ( $file == '.' or $file =='..' or $file=='.svn')

{

continue

}

echo md5_file($dir.$file)//计算每个文件md5值 echo '<br />'

if (is_dir ($dir.$file))

{

file_read_all ($dir.$file.'/')

}

}

}

closedir($dh)

}

}

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