PHP - DOMDocument load XML with encoded name

Question

Lets say that in my flash project I have script that create for me xml files dynamically (by PHP). XML file name is based on specific variable and escaped using escape(variable) in case that variable may (and mostly do) contains unsupported filename chars...

I need to know precise name of xml file later in my flash project, because I'm loading these XML files only if unescape(XMLfile) == variable . There's a lot of variables, so I can't just use String.replace() function to wipe out unsuported fileneme chars...

There's part of PHP file I'm using:

$XMLDom = new DomDocument('1.0', 'UTF-8');
$xmlId = trim($_POST['xmlId']);
if(file_exists($xmlId)){
    $XMLDom ->load($xmlId);
}else{
    $newXMLHandler = fopen($xmlId, 'w') or die("can't open file");
    fclose($newXMLHandler);

    $XMLDom ->load($xmlId);

    .... rest of the code ....

    $XMLDom ->save($xmlId);
}

The result of the code above is that in directory are 2 newly created XML files

One XML empty created by fopen($xmlId, 'w'), named: "fi%20le%2C%2E%40.xml" and second one named: "fi le,[email protected]" where all my new XML data is stored...

Is there any way to load escaped named XML file by PHP?

Thanks in advance.

Arthur.

user797257 · Accepted Answer · 2012-06-01 19:48:03Z

1

I don't feel quite confident I understand your problem, but if your question was to find the analogue function to escape() in PHP, then urlencode() looks like the best match, but you need to research what exactly is being escaped. Note, for example, that there are several different ways to percent-encode strings, especially the multibyte strings. Flash may use escapeMultibyte() or it can also use encodeURIComponent() both encode different subsets of characters, and differently - so beware!

Now, regarding file names, if your HTTP server is running on Unix system, than "fi le,[email protected]" is a valid file name, nothing to worry about - inconvenient some times, but it is a legitimate name.

touch 'fi le,[email protected]'

would create a file, no problems there. Basically, the restricted characters are the slashes and the null character ("\x00"), but it is common to restrict also the characters that may be interpreted as shell commands - this is really up to you.

answered Jun 1, 2012 at 19:48

user797257

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2 Comments

Artur Filipiak Over a year ago

The problem is that XML won't be loaded from escaped (or urlencoded) named file. The DomDocument always unescaping the name which I request for and trying to load 'fi le,[email protected]' instead of 'fi%20le%2C%2E%40.xml' . These names are for example only, what about file called: '/z\*'c."l.xml' ? There's no way even to save it. What I need is a string replacement for my variable which is fully allowed as file name, can be loaded as xml and decoded to original variable.

Artur Filipiak Over a year ago

Yes, It works good with fopen(). Thanks for suggestion. I can't use any incrementing counter bacause all xml's are created based on user input ;)

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