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Question

I know PHP's read, write, and append... but can you insert? or remove last line?

Answer 1

A:

I would say it depends on the structure of you XML document. If the “rest” is predictable, you could cut that part from your file, append the new data and paste the “rest” back:

      ⋮
n-1:     <node>last node</node>
n  :  </root>


      ⋮
n-1:     <node>last node</node>
n  :     <node>new node</node>
n+1:  </root>

Gumbo 2009-07-10 17:23:10

@GumboI think that is exactly what I am trying to do... how would one go about doing this?

Justin Lee 2009-07-10 17:35:57

Answer 2

+3 A:

txwinger had the right idea in his comment on your question. You should use one of PHPs many built-in XML manipulation libraries to add the node, then serialize it and save it as a text file. In SimpleXML, for instance:

$xml = simplexml_load_file('test.xml');
$vote = $xml->addChild('vote', '5');
$vote->addAttribute('id','1_0');
$fp = fopen('test.xml', 'w');
fwrite($fp, $xml->asXML());
fclose($fp);

There are other XML manipulation libraries that might suit your task better

Otterfan 2009-07-10 17:43:29

Do I need to "install" any of these libraries as I don't think I have access to do so on our current server.

Justin Lee 2009-07-10 17:57:56

Probably now. SimpleXML is included by default in all 5.0 + versions of PHP. XMLWriter (another option) is included by default in all 5.1.2+ versions. Your sysadmin might have turned these off, but I doubt it.

Otterfan 2009-07-10 18:03:16

Oops make that "probably not".

Otterfan 2009-07-10 18:03:48

Great! phpinfo says I've got 5.2.6, so I'll give it a shot. Thanks!

Justin Lee 2009-07-10 18:36:21

Is there syntax to give it (add a child node) a single, entirely filled node as a string for it to add (passed to the PHP function by jQuery), versus passing all the variables and building the node in PHP?

Justin Lee 2009-07-10 18:42:15

Works perfectly! Thanks!!!

Justin Lee 2009-07-10 18:59:41

Answer 3

A:

If you are trying to do this the quick and dirty way: If you open the file in "r+" and set the pointer to a blank line between the last element and the end of the file, it will write over the root level elements closing tag, so just add it back after you write the new child element. Bear in mind I have been writing php scripts for all of 4 hours, so there is probably a better way, but this is the simplest I've come up with in my 4 hour career.

$name = $_POST["name"]; $phone = $_POST["phone"];

$fh = fopen("xml-test-1.xml", "r+");
if (!$fh)
{
 die("Failed to open");
}

fseek($fh, -11, SEEK_END);

fwrite($fh, "<person> \n");
fwrite($fh, "<name>$name</name> \n");
fwrite($fh, "<phone>$phone</phone> \n");
fwrite($fh, "</person> \n");
fwrite($fh, "</people> \n");

fclose($fh);

echo "now look and see if anything was added";

sean 2009-12-21 07:48:55

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I know PHP's read, write, and append... but can you insert? or remove last line?

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