CODEWITHSUNDEEP
phphtmlsimple-html-dom
dharanbro
dharanbro

Reputation: 1342

PHP Simple HTML DOM parser

I am working with simple web crawler. Below is simple html code i used to learn.

input.php

<ul id="nav">
    <li>
        <a href="www.google.com">Google</a>
        <ul>
            <li>
                <a href="mail.gmail.com">Gmail</a>
            </li>
        </ul>
    </li>
    <li>
        <a href="www.yahoo.com">Yahoo</a>
        <ul>
            <li>
                <a href="mail.yahoo.com">Yahoo Mail</a>
            </li>
        </ul>
    </li>
</ul>

I need to crawl the first anchor tag in ul[id=nav]->li. The code i used to crawl input.php is

<?php
    include 'simple_html_dom.php';
    $html = file_get_html('input.php');

    foreach ($html->find('ul[id=nav]') as $navUL){
        foreach ($navUL->find('li') as $navUL_LI){
            echo $navUL_LI->find('a',0)->outertext."<br>";              
        }
    }
?>

It Displays all the anchor tag in my input.php. I need to display only google and yahoo. How can i achieve this?

Upvotes: 1

Views: 2440

Answers (6)

Victor Nazarov
Victor Nazarov

Reputation: 126

<?php
$in = '<style>      .catalog-product-view .product.attribute.overview ul {         margin-top: 10px;     } </style><img src="/media/wysiwyg/img/misc/made-in-the-usa-doh-blue4.png"><ul><li>Ships as (12) 40 fl oz bottles</li></ul>';

function parseTags($input, $callback) {
    $len = strlen($input);
    $stack = [];

    $tag = "";
    $data = "";
    $isTag = false;
    $isString = false;
    for ($i=0; $i<$len; $i++) {
       $char = $input[$i];
       if ($char == '<') {
           $isTag = true;
           $tag .= $char;
       } else if ($char == '>') {
           $tag .= $char;
           if (substr($tag, 0, 2) == '</') {
               $close = str_replace('>', '', str_replace('</', '', explode(' ', $tag, 1)[0]));
               $open = str_replace('>', '', str_replace('<', '', explode(' ', end($stack), 1)[0]));
               if ($open == $close) {
                   $callback($tag, $data, $stack, $i, false);
                   array_pop($stack);
               }
           } else if (substr($tag, -2) == '/>') {
               $callback($tag, $data, $stack, $i, false);
           } else {
               $callback($tag, $data, $stack, $i, true);
               $stack[] = $tag;
           }
           $tag = "";
           $data = "";
           $isTag = false;
       } else if ($char == '"' || $char == "'") {
           if ($isString == false) {
               $isString = $char;
           } else if ($isString == $char && $input[$i-1] != '\\') {
               $isString = false;
           }
       } else if ($isTag) { 
           $tag .= $char; 
       } else { 
           $data .= $char; 
       }
    }
}

parseTags($in, function($tag, $data, $stack, $position, $isOpen) use (&$out) {
    print_r(func_get_args());
});

Upvotes: 0

Bijay Rai
Bijay Rai

Reputation: 959

you can simply achieve that by: 

<?php
      foreach ($html->find('ul[id=nav]') as $navUL){
        foreach ($navUL->find('li') as $navUL_LI){
            echo $navUL_LI->find('a',-2)->outertext."<br>";              
        }
    }
?>

Upvotes: 0

Kevin
Kevin

Reputation: 41903

In this case you can directly point it out with children() method. Example:

foreach($html->find('ul#nav') as $ul) {
    foreach($ul->children() as $li) {
        echo $li->children(0)->outertext . '<br/>';
    }
}

Alternatively, you can use DOMDocument + DOMXpath for this too:

$dom = new DOMDocument();
$dom->loadHTML($str);
$xpath = new DOMXpath($dom);
// directly target those links
$links = $xpath->query('//ul[@id="nav"]/li/a');

foreach($links as $a) {
    echo $a->nodeValue . '<br/>';
}

Upvotes: 1

i alarmed alien
i alarmed alien

Reputation: 9530

Try this:

// get the children of the element #nav, i.e. the top level lis
$lis = $html->getElementById("#nav")->childNodes();
// for each child, find the first 'a' element
foreach ($lis as $li) {
    $a = $li->find('a',0);
    // retrieve the link text itself.
    echo "link text: " . $a->innertext() . "\n";
}

See the simple-html-dom manual for details of all these methods.

Upvotes: 0

Denis Kohl
Denis Kohl

Reputation: 750

i have done the same work in Objective-c.

You can use the XML or HTML api's to serialize your html object.

If you want to do this form cold hand... find open tag and the close tag.

After this get first child, then the second and so on...

Upvotes: 0

Yamu
Yamu

Reputation: 1662

<?php
    include 'simple_html_dom.php';
    $html = file_get_html('input.php');

    foreach ($html->find('ul[id=nav]') as $navUL){
        foreach ($navUL->find('li') as $navUL_LI){
            if(strpos($navUL_LI,'google')||strpos($navUL_LI,'google')){
                echo $navUL_LI->find('a',0)->outertext."<br>";
                       }

        }
    }
?>

Upvotes: 1

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