How to extract content from a PHP page?

Question

Guys I’m basically trying to get some data from SEFAZ, to check if it is online or unavailable at the moment I’m not getting it up because I don’t know, I wonder how I can is picking up a certain line of their code ?

Answer 1

You can use the get_http_response_code to check if the page is online and then file_get_contents to download the page.

if(get_http_response_code('http://sefaz.com') != "200"){
    echo "erro";
}else{
    $pagina = file_get_contents('http://sefaz.com');
}

To find a certain line after downloading the page, in this case the choice of AP is by the line content MT the library shall be used SIMPLE_HTML_DOM_PARSER

<?php
    include '../../../library/Simple_HTML_DOM/simple_html_dom.php';
    $html = file_get_html( 'http://www.nfe.fazenda.gov.br/portal/disponibilidade.aspx?versao=0.00&tipoConteudo=Skeuqr8PQBY=' );
    $tdMT = NULL;
    foreach($html->find('td') as $td){
        if($td->innertext === 'MT'){
            $tdMT = $td->parent();
            foreach($tdMT->find('td') as $td){
                echo $td->innertext . '<br>';
            }
        }
    }
?>

What is being done:

1. Inclusion of the library Simple_HTML_DOM
2. Full page download is made
3. The search for tags is done td
4. A check is made if the td is the desired (in case MT)
5. Attribution is made to the parent element of this td in case the tr
6. Impression is made of all the elements present within the td daughter of tr (could be done any computation)

*Note: There is besides plain text as MT and - HTML tags inside the td.

Link to download library: Link