[Rdfapi-php-interest] Question about variable in SPARQL query

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Hi..

I have created a form for the user to input the variable in order to query.
The code as below:

<?php
echo "
<html>
<title>
Test Query
</title>
<body>
<form name=form method=post action=simplequeryprocess.php>
<table>
<tr>
<td><h3>
Insert the Person name:
</h3>
</td>
</tr>
<tr>
<td>
<input type=text name=personname size=70 maxlength=200>
</td>
</tr>
</table>
<table>
<tr><td height=5 colspan=2></td></tr>
<tr valign=center>
<td align=right>
<input TYPE=submit NAME=search VALUE='Search' class=forButton>
<input TYPE=reset  NAME=search VALUE='  Reset  ' class=forButton>
</td>
</form>
</tr>
</table>
</body>
</html>
";
?>
The following is the process file:

<?php
echo "
<html>
<title>
Query Result
</title>
<body>
";
// Include RAP
define("RDFAPI_INCLUDE_DIR", "c:/www/rdfapi-php/api/");
include(RDFAPI_INCLUDE_DIR . "RdfAPI.php");
// Filename of an RDF document
$base="simple.rdf";
// Create a new MemModel
$model = ModelFactory::getDefaultModel();
// Load and parse document
$model->load($base);
//received data
$personname=$_POST['personname'];
$querystring = '

SELECT ?url ?PersonName ?DocumentName
WHERE
 { ?url <http://www.semanticweb.org/ontologies/2009/5/simple.owl#has-name>
?PersonName .
?url <http://www.semanticweb.org/myontology.owl#has-document-name>
?DocumentName
FILTER (?PersonName =  \"${"personname"}\")
}';
$result = $model->sparqlQuery($querystring);
SPARQLEngine::writeQueryResultAsHtmlTable($result);
echo "</body></html>";
?>

However, the \"${"personname"}\" did not carry any value and the sparql
return result as no match.
If I were to change the \"${"personname"}\" to a fix name such as "John",
sparql will return the result.

Can anyone tell me whether the way I am declaring the variable
\"${"personname"}\" is correct or wrong?.

Thanks.

Grahamakmur