get_file_contents（）之后的php字符串不可见字符

Question

I have a .txt file generated from the management shell of an exchange server.

I am using php and want to use get_file_contents() to get the content of the file and then a preg_match() with "DisplayName". This problem applies to the whole file.

$file = file_get_contents("file.txt");

//Does not work
preg_match("/DisplayName/", $file, $matches);

//Does work
preg_match("/D.i.s.p.l.a.y.N.a.m.e/", $file, $matches);

//Returns 1
preg_match("/D(.)i/", $file, $matches);
echo strlen($matches[1][0]);

How do I remove these invisible characters or what could it be? Is there a function in php to find out what this character might be?

https://www.soscisurvey.de/tools/view-chars.php says there are no hidden characters.

Example:

DisplayName : Name

ServerName : Server

PrimarySmtpAddress : Email

EmailAddresses : {Email list}

I hope you guys are able to help me.

Answer 1

Looks like the file is encoded as Unicode where you expect it to be plain ASCII.

Try this:

$file = file_get_contents("file.txt", FILE_TEXT);

or a custom function:

function file_get_contents_utf8($fn) {
     $content = file_get_contents($fn);
      return mb_convert_encoding($content, 'UTF-8',
          mb_detect_encoding($content, 'UTF-8, ISO-8859-1', true));
}

$file = file_get_contents_utf8("file.txt");

Answer 2

Thanks for your help, I was able to fix it like this:

$file = file_get_contents("file.txt");
$file = str_replace(chr(0), "", $file);