Take a value that is within a <span> on another site using PHP

Question

I would like to know how to get a value that is within one of an external URL to use in a given calculation.

Example: http://www.agropan.coop.br/cotac.htm I want to take only the value related to Soy s/Royalts, which is within this span: 56,50

Answer 1

In your case the tag you want to catch has no id or anything that identifies it, so you can only get the value by its index:

<?php

// Desabilita erros da libxml e permite que o usuário obtenha informação do erro como necessitar 
libxml_use_internal_errors(TRUE);

$html = new DOMDocument();
$html->loadHTMLFile('http://www.agropan.coop.br/cotac.htm');

$spans = array();
foreach($html->getElementsByTagName('span') as $span)
{ 
    $spans[] = $span;
}

echo $spans[4]->nodeValue;

?>

Answer 2

You can use a PHP Client that does the processing DOM of the document that is in this URI.

One component that can help you is the Goutte:

<?php

use Goutte\Client;

$client = new Client;
$crawler = $client->request('GET', 'http://www.agropan.coop.br/cotac.htm');
$crawler->filter('span')->each(function ($node) {
    print $node->text()."\n";
});