Make (DOM)XPath::quote only accept strings without NULL bytes

[nielsdos]

The reason is that libxml will cut off on a NULL byte, and so strings containing NULL bytes may not be necessarily safe even when coming out of quoting.

[divinity76]

dang you're right,

$ cat puck.php 
<?php
declare(strict_types=1);
$domd = new DOMDocument();
@$domd->loadHTML("<foo>tes\x00t</foo>");
$xp = new DOMXPath($domd);
var_dump(
    $xp->query("//foo[contains(text(), " . $xp->quote("tes\x00t") . ")]")
);
$ php puck.php 

Warning: DOMXPath::query(): Unfinished literal in /home/hans/projects/misc/puck.php on line 7
bool(false)

can you add a test in /ext/dom/tests/DOMXPath_quote.phpt ?

regardless, LGTM.

[nielsdos]

@divinity76 Added it as a test and added you as co-author for that. Thanks.
As a side note, normally we don't add ZPP tests, but given the potential sensitive use of the function I think asserting the behaviour via a test is fine.