Loop nested nodes in Symfony Crawler

Question

How to loop through all nodes of Dom.

I use latest Symfony Crawler.

Simple example:

<?php

function test()
{
    $crawler = new Crawler($html);

    $crawler
        ->filter('body > ul')
        ->each(function (Crawler $node, $i) {
            loop($node);
        });
}

function loop(Crawler $node)
{
    static $counter;

    if ($node->filter('ul')->count() > 0) {
        loop($node);
    }

    $counter++;
    echo PHP_EOL,'Node: ', $counter, PHP_EOL;
}

I get a message:

Fatal error: Maximum function nesting level of '100' reached, aborting! in /.../vendor/symfony/css-selector/XPath/Extension/NodeExtension.php on line 269

HTML for example:

<body>
    <ul>
        <li>
            <ul>
                <li>foo</li>
                <li>bar</li>
            </ul>
        </li>
        <li>baz</li>
    </ul>
    <ul>
        <li>buz</li>
    </ul>
    <ul>
        <li>uaz</li>
    </ul>
</body>

Thanks

Looks like a stack overflow on your recursive call before you get any trace data. Try putting an if($counter <90) around the call to loop() to quit before a stack overflow. — Andy Joiner
– Andy Joiner, Commented Jun 1, 2015 at 22:23
Yep, it loops for example when I put if($counter < 10), if I put if($counter < 90) fails again. — serghei
– serghei, Commented Jun 1, 2015 at 22:37
Does your trace now show the route it is walking the tree? You should be able to work out why it' snot walking the tree the way you expect. — Andy Joiner
– Andy Joiner, Commented Jun 1, 2015 at 22:42
So you run loop with the same node? Isn't it an infinite recursion? — zerkms
– zerkms, Commented Jun 1, 2015 at 23:18

Alexandru Olaru · Accepted Answer · 2015-06-02 06:33:43Z

2

Increase the value of xdebug.max_nesting_level = 250 in your php.ini: http://xdebug.org/docs/all_settings#max_nesting_level

answered Jun 2, 2015 at 6:33

Alexandru Olaru

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2 Comments

serghei Over a year ago

Why I should increase nesting level for nesting of 4 nodes?

Alexandru Olaru Over a year ago

This is a xdebug error, on a production server you will not get it, so in order to get rid of it 1. Make the nesting lvl bigger or 2. Remove xdebug

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