Blank line at beginning of XML Doc

**Jerry Stuckle** · Aug 9 '08, 01:25 AM

Re: Blank line at beginning of XML Doc

djaekimaar@goog lemail.com wrote:

Hi.
First I apologise if there is a better place to post this. Please let
me know. I also apologise in advance if this is a really stupid
mistake, but now seem to be bashing head against wall.
I have some code that is creating an xml doc
>
$dom = new DOMDocument();
$xmlDoc = $dom->appendChild($d om->createElement( 'root'));
etc.
>
that is then echo d
>
$dom->formatOutput = true;
ob_clean();
$dom->save('php://output');
>
also tried
echo $dom->saveXML();
>
and it results in (inside the -----)
----------------------------------------------------------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<root>
<user id="9">
<firstname>Ti m</firstname>
<lastname>D</lastname>
<email></email>
<houseName>Th e Station</houseName>
>
<houseNo>259</houseNo>
<street>Waterlo o Rd</street>
<village>Waterl oo</village>
<town>London</town>
<county>Londo n</county>
<postcode>SE1 8RW</postcode>
>
</user>
</root>
>
-----------------------------------------------------------------------
Which looks a bit odd - in Firefox there is a blank line before the
xml
and I get the message (By the time it gets back to login.php it has
gone back through a HTTPResponse body.
>
Warning: DOMDocument::lo adXML() [function.DOMDoc ument-loadXML]: XML
declaration allowed only at the start of the document in Entity, line:
2 in /web/zzz/login.php on line 40
Which makes me think the newline at the beginning is causing the
problem
>
Any ideas ?
Thanks for any help
>

It's impossible to tell from just limited excerpts of your code that you
posted. It could be almost anything.

First thing I would suggest is look for any white space outside of the
<?php ... ?tags - this includes new lines, etc. For instance, if you
include another php file, do you have a newline after the php end tag?

Otherwise, please put together a *small* example which shows the problem
and post it here so we can look at it more closely.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attgl obal.net
=============== ===

**djaekimaar@googlemail.com** · Aug 17 '08, 05:55 PM

Re: Blank line at beginning of XML Doc

Hi - sorry its taken a while to get back. Combination of a short hol
and trying to solve it myself.
The set up I have is as follows (Its complicated due to trying to use
a sort of MVC and REST)
A Link from a homepage to login.php

Logon.php then creates a verification class that takes the email
address and checks against a db. This returns a userid that is then
used in a call to UserProfile.

In UserProfile I am trying to use REST so I have the following code

public function exec($u) {

//print 'In user profile';
$req =& new HTTP_Request("h ttp://localhost/sbc/dbCaller/user/$u");
$req->addHeader('HTT P_ACCEPT', 'application/xml,application/xhtml
+xml,applicatio n/xml;q=0.9,*/*;q=0.8');

if (!PEAR::isError ($req->sendRequest()) ) {
req->getResponseBod y();

Using apache readback this gets caught by dbCaller
dbCaller is just a handler that at the moment just creates a test
class (see below)
Test uses the rest of the url to work out what it needs to return and
creates a DOM object of the xml.
The creation seems to work ok, no exceptions. and the return to
dbCaller results in a DOMDocument object in dbCaller.
But it then falls down . I dont seem to be able to get the
DOMDocument object back through the http response. (In UserProfile)
Have tried creating a DOMDocument object and loading the responsebody
into it - doesnt work. In fact I dont seem to be able to send a
DOMDocument back through the response, and
am begining to think its not possible. Am new to this and may be
missing something v obvious.

Any comments of any sort welcome :-)

test class

<?php
/*
* Created on 4 Aug 2008
*
* To change the template for this generated file go to
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
require_once ('Database.php' ); // Standard functions.

class test {
function exec() {
$conn = new dbConnection;
$c = $conn->getConn();
//print 'In test';

$urlString = substr($_SERVER['REQUEST_URI'], strlen('/sbc/
dbCaller'));

$urlParts = explode('/', $urlString); //create an array of the parts
after the base url

$lastPart = array_pop($urlP arts); //get the last one

$dotPosition = strpos($lastPar t, '.'); // figure out what
extension is required
if ($dotPosition !== FALSE) {
$this->extension = substr($lastPar t, $dotPosition + 1);
$lastPart = substr($lastPar t, 0, $dotPosition);
}
array_push($url Parts, $lastPart);

if (isset($urlPart s[0]) && $urlParts[0] == '') {
array_shift($ur lParts);
}

if (isset($urlPart s[0])) $this->table = $urlParts[0];
$sql = 'SELECT * FROM '. $this->table;
$row = $c->query($sql);
$res = $row->fetch(PDO::FET CH_ASSOC);
$arr = array_keys($res );
$cols = $row->columnCount( );

if (count($urlPart s) 1 && $urlParts[1] != '') {
array_shift($ur lParts);
$arrCount = count($urlParts );
foreach ($urlParts as $uid) {
if ($uid != '') {
//print $uid;
$this->uid[] = $uid;
}
}
}
//build the query
$sql2 = 'SELECT * FROM '. $this->table;
//print 'Arr' . $arrCount;
if ($arrCount >= 1) {
$sql2 .= ' WHERE ' . $arr[0] . ' = ' . $this->uid[0];
if ($arrCount >= 2) {
for ($f=1; $f<=($arrCount-1); $f++) {
$sql2 .= ' AND ' . $arr[$f] . ' = ' . $this->uid[$f];
}
}
}
//print 'SQL' . $sql2;
$dom = new DOMDocument();
$xmlDoc = $dom->appendChild($d om->createElement( 'root'));
foreach ($c->query($sql2) as $row2) {
$rec = $xmlDoc->appendChild($d om->createElement( $this->table));
$rec->setAttribute($ arr[0], $row2[$arr[0]]);
for ($i= 1; $i< $cols; $i++) {
if ($arr[$i] != 'password') {
$rec->appendChild($d om->createElement( $arr[$i], $row2[$arr[$i]]));
}
}
}
$dom->formatOutput = true;
//ob_clean();
//$dom->save('php://output');
//$p = $dom->saveXML();
return $dom;
//print $p;

}
}
?>

**Jerry Stuckle** · Aug 19 '08, 04:05 PM

Re: Blank line at beginning of XML Doc

djaekimaar@goog lemail.com wrote:

Hi - sorry its taken a while to get back. Combination of a short hol
and trying to solve it myself.
The set up I have is as follows (Its complicated due to trying to use
a sort of MVC and REST)
A Link from a homepage to login.php
>
Logon.php then creates a verification class that takes the email
address and checks against a db. This returns a userid that is then
used in a call to UserProfile.
>
In UserProfile I am trying to use REST so I have the following code
>
public function exec($u) {
>
//print 'In user profile';
$req =& new HTTP_Request("h ttp://localhost/sbc/dbCaller/user/$u");
$req->addHeader('HTT P_ACCEPT', 'application/xml,application/xhtml
+xml,applicatio n/xml;q=0.9,*/*;q=0.8');
>
>
if (!PEAR::isError ($req->sendRequest()) ) {
req->getResponseBod y();
>
Using apache readback this gets caught by dbCaller
dbCaller is just a handler that at the moment just creates a test
class (see below)
Test uses the rest of the url to work out what it needs to return and
creates a DOM object of the xml.
The creation seems to work ok, no exceptions. and the return to
dbCaller results in a DOMDocument object in dbCaller.
But it then falls down . I dont seem to be able to get the
DOMDocument object back through the http response. (In UserProfile)
Have tried creating a DOMDocument object and loading the responsebody
into it - doesnt work. In fact I dont seem to be able to send a
DOMDocument back through the response, and
am begining to think its not possible. Am new to this and may be
missing something v obvious.
>
Any comments of any sort welcome :-)
>
test class
>
<?php
/*
* Created on 4 Aug 2008
*
* To change the template for this generated file go to
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
require_once ('Database.php' ); // Standard functions.
>
class test {
function exec() {
$conn = new dbConnection;
$c = $conn->getConn();
//print 'In test';
>
$urlString = substr($_SERVER['REQUEST_URI'], strlen('/sbc/
dbCaller'));
>
$urlParts = explode('/', $urlString); //create an array of the parts
after the base url
>
>
$lastPart = array_pop($urlP arts); //get the last one
>
$dotPosition = strpos($lastPar t, '.'); // figure out what
extension is required
if ($dotPosition !== FALSE) {
$this->extension = substr($lastPar t, $dotPosition + 1);
$lastPart = substr($lastPar t, 0, $dotPosition);
}
array_push($url Parts, $lastPart);
>
if (isset($urlPart s[0]) && $urlParts[0] == '') {
array_shift($ur lParts);
}
>
if (isset($urlPart s[0])) $this->table = $urlParts[0];
$sql = 'SELECT * FROM '. $this->table;
$row = $c->query($sql);
$res = $row->fetch(PDO::FET CH_ASSOC);
$arr = array_keys($res );
$cols = $row->columnCount( );
>
if (count($urlPart s) 1 && $urlParts[1] != '') {
array_shift($ur lParts);
$arrCount = count($urlParts );
foreach ($urlParts as $uid) {
if ($uid != '') {
//print $uid;
$this->uid[] = $uid;
}
}
}
//build the query
$sql2 = 'SELECT * FROM '. $this->table;
//print 'Arr' . $arrCount;
if ($arrCount >= 1) {
$sql2 .= ' WHERE ' . $arr[0] . ' = ' . $this->uid[0];
if ($arrCount >= 2) {
for ($f=1; $f<=($arrCount-1); $f++) {
$sql2 .= ' AND ' . $arr[$f] . ' = ' . $this->uid[$f];
}
}
}
//print 'SQL' . $sql2;
$dom = new DOMDocument();
$xmlDoc = $dom->appendChild($d om->createElement( 'root'));
foreach ($c->query($sql2) as $row2) {
$rec = $xmlDoc->appendChild($d om->createElement( $this->table));
$rec->setAttribute($ arr[0], $row2[$arr[0]]);
for ($i= 1; $i< $cols; $i++) {
if ($arr[$i] != 'password') {
$rec->appendChild($d om->createElement( $arr[$i], $row2[$arr[$i]]));
}
}
}
$dom->formatOutput = true;
//ob_clean();
//$dom->save('php://output');
//$p = $dom->saveXML();
return $dom;
//print $p;
>
}
}
?>
>
>
>

Well, you showed your class Test, which you indicate is working
properly. But you never showed how you're calling Test->exec() and
trying to return the document back to the caller.

But I'm wondering why you're using an HTTP_Request object here to fetch
the document, when it's on your own server. You're just creating an
additional load on the server. It would be more efficient to just
create the object of Test and create the dom document right there. As
it is, you have a huge security hole - what happens, for instance, if
someone enters on their browser
"http://www.example.com//sbc/dbCaller/user/joeblow"?

But if you insist on doing it this way, you have to handle it just like
you would a browser request. You need to echo (or print) the document.
But you can't do that directly, i.e. you can't just say echo $dom;
because it's not a simple object. You need to either serialize it (not
recommended) or convert to xml and print the resulting xml. Then you
can get the xml and convert it back to a DomDocument.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attgl obal.net
=============== ===

**djaekimaar** · Aug 25 '08, 05:05 PM

Re: Blank line at beginning of XML Doc

Thanks a lot for replying Jerry. You are right on all counts.
The idea was to use REST between MVC layers as well as externaly. Have
trashed that idea for the reasons you mentioned, and I hope a better
understanding of REST. You were also right about the security hole.
Though I was aware of that and was planning to pass the headers from
the originating request through and then have the lower classes verify
by the digest in the same way.
So thanks for that and thanks for bearing with me as I worked it out.
I solved the problem by using dom->saveHTML() instead of dom-

>saveXML() and then printing that.

thanks again

Blank line at beginning of XML Doc

Blank line at beginning of XML Doc

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