DOMXPath返回零

Question

Im trying to extract some information from a website. The info I need is contained in a table, I have already created a query to find it. When using the console from Chrome I can see the table I need is returned by the expression. But when I set up the PHP code, the query returns zero.

This is from the Chrome console

And this is my PHP code

$ch = curl_init($domain);
curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
$cl = curl_exec($ch);
$dom = new DOMDocument();
@$dom->loadHTML($cl);
$xpath = new DOMXPath($dom);

$table = $xpath->query("//div[@id='content_fmainplace']//form/table/tbody/tr[15]//table");
echo $table->length;

Any ideas? What am I missing here?

Answer 1

You really dont need to target the div. Just target the id of the table instead. Consider this example: Sample Output

$domain = 'http://app.cfe.gob.mx/Aplicaciones/CCFE/Tarifas/Tarifas/tarifas_casa.asp?Tarifa=DACTAR1E&Temporada4=Verano&Anio=2014&imprime=&Periodo=4&mes2=a+septiembre.&mes=1';
$ch = curl_init($domain);
curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
$cl = curl_exec($ch);
$dom = new DOMDocument();
libxml_use_internal_errors(true);
$dom->loadHTML($cl);
libxml_clear_errors();
$xpath = new DOMXPath($dom);

// target the title
$title = $values = $xpath->query('//table[@id="Table1"]/tr[1]/td[1]/form/table/tr[14]')->item(0)->nodeValue; // title rows
$rows = $xpath->query('//table[@id="Table1"]/tr[1]/td[1]/form/table/tr[15]/td/table/tr');
$row_values = array();

// process td elements
foreach($rows as $index => $row) {
    foreach($row->childNodes as $td) {
        // clean up
        $row_values[$index][] = preg_replace( '/\s+/', '', trim($td->nodeValue));
    }
    // clean up again
    $row_values[$index] = array_filter($row_values[$index]);
}    

?>

<!-- print them -->
<h1><?php echo $title; ?></h1>
<table cellpadding="10">
<?php foreach($row_values as $values): ?>
    <tr><?php foreach($values as $value): ?>
        <td><?php echo $value; ?></td>
    <?php endforeach; ?></tr>
<?php endforeach; ?>
</table>