PHP:Trying to get property of non-object - php

Question

There are many posts on this topic but I did not get the required answer. Hence, I am here.
I have been getting Notice: Trying to get property of non-object in /opt/lampp/htdocs/amit/crawlnepalstock.php on line 49 error in my php page.
Here is my code
<?php
include_once('simple_html_dom.php');
error_reporting(E_ALL);
$html = file_get_html('http://nepalstock.com/datanepse/index.php');
$indexarray = array('s_no','stocksymbol', 'LTP', 'LTV', 'point_change', 'per_change', 'open','high', 'low', 'volume','prev_close');
$stocks = array();
$maincount = 0;
$tables = $html->find('table[class=dataTable]');
$str = $html->plaintext;
$matches = array();
foreach ($tables[0]->find('tr') as $elementtr) {
$count = 0;
$temp = array();
$anchor = $elementtr->children(1)->find('a',0);
$splits = preg_split('/=/', $anchor->href); **//line 49**
$temp['stocksymbol'] = isset($splits[1]) ? $splits[1] : null;
$temp['fullname'] = $elementtr->children(1)->plaintext;
$temp['no_of_trans'] = $elementtr->children(2)->plaintext;
$temp['max_price'] = $elementtr->children(3)->plaintext;
$temp['min_price'] = $elementtr->children(4)->plaintext;
$temp['closing_price'] = $elementtr->children(5)->plaintext;
$temp['total_share'] = $elementtr->children(6)->plaintext;
$temp['amount'] = $elementtr->children(7)->plaintext;
$temp['previous_close'] = $elementtr->children(8)->plaintext;
$temp['difference'] = $elementtr->children(9)->plaintext;
$stocks[] = $temp;
}
$html->clear();
unset($html);
echo '<pre>';
print_r($stocks);
echo '</pre>';
?>
I have not included simple_html_dom.php class as it is quite long. Your opinions are very much appreciated. You can find simple_html_dom.php file online in case http://sourceforge.net/projects/simplehtmldom/files/

Answer 1

You are trying to access property of non-object or from null object. e.g.
$obj = null;
echo $boject->first_name // this will produce same error as you are getting.
// another example may be
$obj = array();
echo $obj->first_name; // this will also produce same error.
In code sample Line 49 is not clear so you should check yourself this type of error on line 49.

Answer 2

This is happening because there is no longer a td[align="center"] tag found in the google.com document. Perhaps it was there when the code was first written.
So, what the others are saying about a non-object is true, but because the HTML was not found, there is not an object to use the ->plaintext method on.
As of 12/11/2020, if you change the URL found in line 6 of example_basic_selector.php to this:
$html = file_get_html('https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_td_align_css');
And change this line
echo $html->find('td[align="center"]', 1)->plaintext . '';
to:
echo $html->find('td style="text-align:right"', 1)->plaintext. '';
the error will go away because the text it searches for is found, and thus the method works as intended.