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PHP - DOMXpath - get result

I have errors when I want to print the result of an expression of an expression using XPath.

$ url = $ xpath-> evaluate ('// a / @ href', $ event); echo $ url;

I have this error: Catchable fatal error: Object of class DOMNodeList cannot be converted to a string

My code is:

<?php
    // Get the HTML Source Code
    $url='http://www.parisbouge.com/events/2012/05/01/';
    $source = file_get_contents($url);

    // DOM document Creation
    $doc = new DOMDocument;
    $doc->loadHTML($source);

    // DOM XPath Creation
    $xpath = new DOMXPath($doc);

    // Get all events
    $events = $xpath->query('//li[@class="nom"]');

    // Count number of events
    printf('There is %d events<br />', $events->length);

    // List all events
    for($i = 0; $i < ($events->length); $i++) {
        $event = $events->item($i);
        $url = $xpath->evaluate('//a/@href', $event);
        $nom = $xpath->evaluate('//a/text()', $event);
        $lieu = $xpath->evaluate('../li[@class="lieu"]/a/text()', $event);
        echo "Result : $url $nom $lieu <br/>";
    }
?>
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3 answers

Try this to get node information.

 // List all events
for($i = 0; $i < ($events->length); $i++) {
    $event = $events->item($i);
    $url = $xpath->evaluate('.//a/@href', $event);
    $nom = $xpath->evaluate('.//a/text()', $event);
    $lieu = $xpath->evaluate('../li[@class="lieu"]/a/text()', $event);

    $result = '';
    if ($url->length > 0) {
        $result .= $url->item(0)->value;
    }

    if ($nom->length > 0) {
        $result .= $nom->item(0)->wholeText;
    }

    if ($lieu->length > 0) {
        $result .= $lieu->item(0)->wholeText;
    }

    echo $result . "<br />";
    //echo "Result : " . $url->item(0)->value . ' | ' . $nom->item(0)->wholeText  . ' | ' . $lieu->item(0)->wholeText . "<br/>";
}

Remember to add a check if node exists etc. To check if there are any nodes, you can check the length of the List node or suppress errors, as suggested by Gordon.

+5
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Quote http://php.net/manual/de/domxpath.evaluate.php

, , DOMNodeList, , XPath.

XPath , , - , //, " ". echo $url->length;, , 460 ( node).

http://www.w3.org/TR/xpath/#path-abbrev

  • //para , , para , node
  • .//para node

, .//a/@href. 1 echo $url->length;, ,

$url = $xpath->evaluate('string(.//a/@href)', $event);
$nom = $xpath->evaluate('string(.//a)', $event);
$lieu = $xpath->evaluate('string(../li[@class="lieu"]/a)', $event);

, DOMDocument

libxml_use_internal_errors(true);
$doc = new DOMDocument;
$doc->loadHTMLFile('http://www.parisbouge.com/events/2012/05/01/');

libxml_use_internal_errors .

+4

$url = $xpath->evaluate('string(.//a/@href)', $event); echo $url ;

href a, $event, , node

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