eval template variable

Sorry, I’m a newbie. How do I evaluate a template variable in php to use it in a logic statement?

simplified example:
// calling function from a chunk
[[mysnippet?myvar="[*my_template_var*]"]] //my_template_var has a default value of 1


// mysnippet code
echo $myvar; // outputs "[*myvar*]" to the output file, then modx evalutes it to 1 and replaces [*myvar*] in the output file with 1

$x = (int)$myvar; // x is 0 because myvar containts "[*myvar*]", not 1

if ($x == 1) { // always evaluates false
echo ’1’;
} else {
echo ’0’;
}
?>

Snippet parameters are not surrounded with quote marks, rather with backticks `value`.

You can deal with TVs programmatically within snippets using the API function

http://wiki.modxcms.com/index.php/API:getTemplateVar