Solution for “Fatal error: Maximum function nestin

Question

I have made a function that finds all the URLs within an html file and repeats the same process for each html content linked to the discovered URLs. The function is recursive and can go on endlessly. However, I have put a limit on the recursion by setting a global variable which causes the recursion to stop after 100 recursions.

However, php returns this error:

Fatal error: Maximum function nesting level of '100' reached, aborting! in D:\wamp\www\crawler1\simplehtmldom_1_5\simple_html_dom.php on line 1355

I found a solution here: Increasing nesting function calls limit but this is not working in my case.

I am quoting one of the answers from the link mentioned above. Please do consider it.

"Do you have Zend, IonCube, or xDebug installed? If so, that is probably where you are getting this error from.

I ran into this a few years ago, and it ended up being Zend putting that limit there, not PHP. Of course removing it will let >you go past the 100 iterations, but you will eventually hit the memory limits."

Is there a way to increase the maximum function nesting level in PHP

Answer 1

Go into your php.ini configuration file and change the following line:

xdebug.max_nesting_level=100

to something like:

xdebug.max_nesting_level=200

Answer 2

In your case it's definitely the crawler instance is having more Xdebug limit to trace error and debug info.

But, in other cases also errors like on PHP or core files like CodeIgniter libraries will create such a case and if you even increase the x-debug level setting it would not vanish.

So, look into your code carefully :) .

Here was the issue in my case.

I had a service class which is library in CodeIgniter. Having a function inside like this.

 class PaymentService {

    private $CI;

    public function __construct() {

        $this->CI =& get_instance();

   }

  public function process(){
   //lots of Ci referencing here...
   }

My controller as follow:

$this->load->library('PaymentService');
$this->process_(); // see I got this wrong instead  it shoud be like 

Function call on last line was wrong because of the typo, instead it should have been like below:

$this->Payment_service->process(); //the library class name

Then I was keeping getting the exceed error message. But I disabled XDebug but non helped. Any way please check you class name or your code for proper function calling.

Answer 3

A simple solution solved my problem. I just commented this line:

zend_extension = "d:/wamp/bin/php/php5.3.8/zend_ext/php_xdebug-2.1.2-5.3-vc9.dll

in my php.ini file. This extension was limiting the stack to 100 so I disabled it. The recursive function is now working as anticipated.

Answer 4

Check recursion from command line:

php -r 'function foo() { static $x = 1; echo "foo ", $x++, "\n"; foo(); } foo();'

if result > 100 THEN check memory limit;

Answer 5

I had a error when i was installing many plugins So the error 100 showed including the location of the last plugin that i installed C:\wamp\www\mysite\wp-content\plugins\"..." so i deleted this plugin folder on the C: drive then everything was back to normal.I think i have to limit the amount of plug-in i install or have activated .good luck i hope it helps

Answer 6

Rather than going for a recursive function calls, work with a queue model to flatten the structure.

$queue = array('http://example.com/first/url');
while (count($queue)) {
    $url = array_shift($queue);

    $queue = array_merge($queue, find_urls($url));
}

function find_urls($url)
{
    $urls = array();

    // Some logic filling the variable

    return $urls;
}

There are different ways to handle it. You can keep track of more information if you need some insight about the origin or paths traversed. There are also distributed queues that can work off a similar model.