在foreach中插入xpath的动态变量

Question

is it possible for xpath to take dynamic values inside a foreach;;

p.e i have try with the bellow code and i get: Trying to get property of non-object error

foreach ($srcov as $src) {
   $qCoverXml = $coverXml->xpath('//cover/code[.= "'.  $srcC->Code  .'" ]/parent::*');
   echo  $qCoverXml->name;
}

I'm doing something wrong; thanks

Answer 1

well, quoting simplexml documentation for xpath() method:

Returns an array of SimpleXMLElement objects or FALSE in case of an error.

So, there are 2 things you did wrong.

1. you should check for error-cases
2. you should treat result as array

it will look something like this:

foreach ($srcov as $src) {
    $qCoverXml = $coverXml->xpath('//cover/code[.= "'.  $srcC->Code  .'" ]/parent::*');

    if (false === $qCoverXml) {
        echo "ERROR: request for {$srcC->Code} failed somehow
";
        continue;
    }

    if (count($qCoverXml) == 0) {
        echo "ERROR: request for {$srcC->Code} didn't return any elements
";
        continue;
    }

    echo  $qCoverXml[0]->name."
";
}