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[Simplexml] please explain: while(list( , $node) = each($result))

Posted on 2009-05-11
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Last Modified: 2012-08-14
The php.net page about simplexml and xpath has an example (see below or http://nl3.php.net/manual/en/function.simplexml-element-xpath.php), but I would like to see some explanation of part of the code.

while(list( , $node) = each($result))

1) Can someone explain the list function?
2) Is it possible to get $node back as another xml-string?
3) Why can't I use an expression like $xml->xpath('b/c') directly for output?
<?php
$string = <<<XML
<a>
 <b>
  <c>text</c>
  <c>stuff</c>
 </b>
 <d>
  <c>code</c>
 </d>
</a>
XML;
 
$xml = new SimpleXMLElement($string);
 
/* Search for <a><b><c> */
$result = $xml->xpath('/a/b/c');
 
while(list( , $node) = each($result)) {
    echo '/a/b/c: ',$node,"\n";
}
 
/* Relative paths also work... */
$result = $xml->xpath('b/c');
 
while(list( , $node) = each($result)) {
    echo 'b/c: ',$node,"\n";
}
?>

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Question by:R7AF
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2 Comments
 
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by:
Beverley Portlock earned 500 total points
ID: 24353111
List() is used for grabbing array values and assigning them to ordinary variables like so

while (list($id, $name, $salary) = mysql_fetch_row($result)) {
    echo " <tr>\n" .
          "  <td><a href=\"info.php?id=$id\">$name</a></td>\n" .
          "  <td>$salary</td>\n" .
          " </tr>\n";
}

so instead of returning an array with three elements, the values are inserted into the three variables. See http://www.php.net/list for more examples.
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LVL 34

Assisted Solution

by:Beverley Portlock
Beverley Portlock earned 500 total points
ID: 24353119
BTW, if you want info on "each" then see  http://www.php.net/each
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