Notice: Undefined offset: 0 - php

Question

i have been working on some application which involves the cURL operation and then Scraping the content of particular URLs.
And there are few computation/calculations following the Scraping.
The issue which i'm facing right now is related to UNDEFINED ARRAY INDEX.
Here are few functions facing like issues:
{Notice: Undefined offset: 0 in D:\xampp\htdocs\Alps-Phase2\alps\include\alpsOP\scrap-process-request2.php on line 263}
there are more functions similar to these:
function getDomainName($objScrap)
{
try
{
$result = $objScrap->getDomainName();
return $result; //Notice: Undefined offset: 0
}
catch( Exception $e)
{
echo "Error in getDomainName !";
return FALSE;
}
}
function getDataForDomainName($objScrap)
{
try
{
$result = $objScrap->checkForKeywordInDomain();
return $result[0]; // Notice: Undefined offset: 0
}
catch( Exception $e)
{
echo "Error in getDataForDomainName !";
return FALSE;
}
}
function getDensityForDomainName($objScrap){
try
{
$result = $objScrap->getDomainDensity();
return $result[0]; // Notice: Undefined offset: 0
}
catch( Exception $e)
{
echo "Error in getDensityForDomainName !";
return FALSE;
}
}
The function definitions for some calls:
function getDomainDensity()
{
$result=$this->getDomainName();
return $this->getKeywordDensity($result);
}
function getDomainName()
{
preg_match($this->_regExpDomain,$this->_url,$match);
if($match != NULL)
return $match[2];
else
return array(
0=> 'Please check URL '.$this->$_url.' [Domain Name]',
'error' => 'Please check URL '.$this->$_url.' [Domain Name]'
);
}
function getKeywordDensity(&$subject)
{
$splitKeywordCountTotal_len=0;
$splitKeywordCount = array();
$resultArray = array();
for($count_i=0;$count_i<count($this->_keywords);$count_i++)
{
$splitKeyword = $this->splitKeyword($this->_keywords[$count_i]);
$splitKeywordCount=0;
$splitKeywordCount = $this->prepareResultArray($subject,NULL,$splitKeyword);
$matchedKeywordCharacterCount=0;
$f=0;
foreach ($splitKeywordCount as $val=>$key)
{
$splitKeywordCount[$f][2]=strlen($key[0]);
$splitKeywordCount[$f][3]=$key[1]*strlen($key[0]);
$matchedKeywordCharacterCount=$matchedKeywordCharacterCount+$splitKeywordCount[$f][3];
$f++;
}
$totalWordsInVisibleContent = $this->getNumberOfWordsInSubject($subject);
$f=0;
$totalWordsInVisibleContent_len=0;
foreach ($totalWordsInVisibleContent as $val=>$key)
{
$totalWordsInVisibleContent_len=$totalWordsInVisibleContent_len+strlen($key);
}
$splitKeywordCountTotal = 0;
for($count_j=0;$count_j < count($splitKeywordCount);$count_j++)
{
$splitKeywordCountTotal = $splitKeywordCountTotal + $splitKeywordCount[$count_j][1];
$splitKeywordCountTotal_len = $splitKeywordCountTotal_len + $splitKeywordCount[$count_j][2];
}
$resultArray[$count_i] = array();
$resultArray[$count_i][0] = $this->_keywords[$count_i];
$resultArray[$count_i][1] = $matchedKeywordCharacterCount/ ($totalWordsInVisibleContent_len);
$resultArray[$count_i][2] = $splitKeywordCountTotal;
$resultArray[$count_i][3] = $matchedKeywordCharacterCount;
$resultArray[$count_i][4] = $totalWordsInVisibleContent;
$resultArray[$count_i][5] = $splitKeywordCountTotal_len;
$resultArray[$count_i][6] = $totalWordsInVisibleContent_len;
}
return $resultArray;
}
moreover, i plan to run half a million URLs for the same application. If these NOTICES keep on showing up, my application would be facing poor performance.
So guys, need help in resolving the issue.
** sorry for the drafting of code... new to the forum , dint know how to use the constructs.. :(

Answer 1

Turn Off Html errors
include the following on the top
error_reporting(E_ALL);
ini_set('display_errors', 'On');
ini_set('html_errors', 'Off');

Answer 2

I have faced such an issue just today! I use PHP7.3.5 and I get the same error, for searching around I found the solution to be:
Instead of:
try
{
$result = $objScrap->checkForKeywordInDomain();
return $result[0]; // Notice: Undefined offset: 0
}
Change to:
try
{
$result = $objScrap->checkForKeywordInDomain();
if(isset($result[0])){
return $result[0];
}
}
hope this can help anyone }else{ :).