use php variables in simple xml

We are just learning vxml and are trying to use $_REQUEST to get a variable from the url and place it in a dom doc to create a simple xml/vxml output -

We have tried the following code but get a parse error -
Parse error: syntax error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING in xxxxxxxxxxxxxx.php on line 10 -

What are we missing -
Thanks in advance for the help

<?php
$doc = new DomDocument('1.0');
 $doc ="<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
 $doc .="<vxml version = \"2.1\" >\n";
$doc .="<form id=\"mainDialog\">\n";
$doc .="<prompt> your caller id is <?php $_REQUEST['callerid'];?></prompt>\n";      
$doc .="</form>\n";
$doc .="</vxml>\n";
$sxe = new SimpleXMLElement($doc);
    echo $sxe->asXML();
?>
rwinnickAsked:
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Chris StanyonWebDevCommented:
You'll need to concatenate the request:
$doc .="<prompt> your caller id is " . $_REQUEST['callerid'] . "</prompt>\n"; 

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Chris StanyonWebDevCommented:
An alternative is to use the HereDoc approach. Doing this is often easier to debug because you don't have to escape everything. If you do it this way, you'll need to wrap your $_REQUEST in curly brackets:

$doc = new DomDocument('1.0');
$doc = <<<EOT
<?xml version="1.0" encoding="utf-8"?>
<vxml version = "2.1" >
	<form id="mainDialog">
		<prompt> your caller id is {$_REQUEST['callerid']}</prompt>      
	</form>
</vxml>
EOT;

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Ray PaseurCommented:
+1 for HEREDOC.  It makes everything easier.  Heed, but do not be put off, by the warning.
http://php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc

There does not appear to be any need for DOMDocument or SimpleXMLElement here.
Example: http://iconoun.com/demo/temp_rwinnick.php?callerid=ABC

<?php // demo/temp_rwinnick.php
error_reporting(E_ALL);

// USE THE REQUEST VARIABLE OR A DEFAULT VALUE
$cid = !empty($_REQUEST['callerid']) ? $_REQUEST['callerid'] : "MISSING";

// CREATE THE XML STRING USING HEREDOC NOTATION
$doc = <<<EOD
<?xml version="1.0" encoding="utf-8"?>
<vxml version = "2.1" >
<form id="mainDialog">
<prompt>Your caller id is $cid</prompt>
</form>
</vxml>
EOD;

// WRITE THE XML TO THE BROWSER
echo $doc;

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rwinnickAuthor Commented:
Chris provided initial insight and Ray elaborated in depth so owe both you guys our thanks and feel it's fair to split the points evenly -
Hope this is OK with all -
As always EE is the greatest -
Thanks
Richard
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