Hi guys,

Im trying to make a webscrapper and im having a huge problem when retrieving huge amount of data. I have tried to increase the memory through PHP.ini but its still doesnt solve the problem.

The webscrapper I want to make is to retrieve data from journal database and put it into an excel file. While it is working with small datasets, it will run out of memory when retrieving large datasets.

Here is the code :
x
PHP Code:

function fetchRawData($url,$search,$currentpagenumber,$numpage,$numrecordtotalsofar) {
    if(
$currentpagenumber<$numpage) {
        
//initialise curl
        
$url "http://ieeexplore.ieee.org/search/searchresult.jsp?queryText%3D".$search."&rowsPerPage=100&pageNumber=".$currentpagenumber."&resultAction=ROWS_PER_PAGE";
        echo 
"<br>new url = ".$url."<br>";

        
$ch curl_init();
        
curl_setopt($ch,CURLOPT_URL,$url);
        
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
        
curl_setopt($ch,CURLOPT_FAILONERROR,true);
        
curl_setopt($ch,CURLOPT_FOLLOWLOCATION,true);
    
//    curl_setopt($ch,CURLOPT_TIMEOUT,50000);
        
curl_setopt($ch,156,500000000);
        
curl_setopt($ch,155,500000000);
        
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
        
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);
        
        
$data=curl_exec($ch);
        if(!
$data) {
            
var_dump(curl_getinfo($ch));
            die();
        }

        
        

        
//parsing data
        
$parsedData = array();
        
phpQuery::newDocumentHTML($data);
        
$arrtitle = array();
        
        
$posttitle=1;
        if(
$currentpagenumber<2) {
            
$numrecordsofar=1;
        } else
        {
            
$numrecordsofar=$numrecordtotalsofar;
        }


        
//get the title, author and year of publication
        
foreach(pq("a") as $link) {
            
$title pq($link)->text();
            if(
$title) {
                
//use regular expression to get the relevant information
                
if (preg_match("*articleDetails.jsp*"pq($link)->attr('href'))&&$gettitle<1) {
                    if(!(
preg_match("*View full abstract*"$title)))
                    {
                        
$dummyvar=$numrecordsofar+$posttitle;
                        
array_push($arrtitle,$title);
                        
$countrecord++;
                        
$gettitle=1;
                    }
                }
            }
        }
        
        
//get the number of data
        
foreach(pq("span") as $link) {
            
$title pq($link)->text();
            if(
$title) {
                if (
preg_match("*display-status results-returned*"pq($link)->attr('class'))) {
                    
$countnumberonly preg_replace("*Results returned*"""$title);
                    
$totalpageint intval($countnumberonly);
                    
//calculate how many pages needed and record the current page
                    
$totalpageint intval($totalpageint 100)+2;
                }
            }


        }

        
//initialise write to excel
        
$objPHPExcel = new PHPExcel();
        
$objPHPExcel->getProperties()->setCreator("Maarten Balliauw")
                                     ->
setLastModifiedBy("Maarten Balliauw")
                                     ->
setTitle("PHPExcel Test Document")
                                     ->
setSubject("PHPExcel Test Document")
                                     ->
setDescription("Test document for PHPExcel, generated using PHP classes.")
                                     ->
setKeywords("office PHPExcel php")
                                     ->
setCategory("Test result file");
        
        
// Set active sheet index to the first sheet, so Excel opens this as the first sheet
        
$objPHPExcel PHPExcel_IOFactory::load("IEEE_Scrap.xlsx");
        
$objPHPExcel->setActiveSheetIndex(0);
        
$objPHPExcel->createSheet();
        
$row $objPHPExcel->getActiveSheet()->getHighestRow()+1;

        
//get data from arrays    
        
for($j=0;$j<count($arrtitle);$j++) {
            if(isset(
$arrtitle[$j])) {
                
$dummyvar=$numrecordsofar+$j;
                
$objPHPExcel->getActiveSheet()->SetCellValue('A'.$dummyvar,$arrtitle[$j]);
            } else {
                
$dummyvar=$numrecordsofar+$j;
                
$globalIEEE[$tempcount+$j][0]="No Data";
                
$objPHPExcel->getActiveSheet()->SetCellValue('A'.$dummyvar,"No Data");
            }
        }
        
$objWriter = new PHPExcel_Writer_Excel2007($objPHPExcel);
        
$objWriter->save('IEEE_Scrap.xlsx');
        
        
//close curl and phpexcel
        
curl_close($ch);
        unset(
$ch);
        unset(
$objPHPExcel);
        unset(
$objWriter);
        
$currentpagenumber++;
        
$numrecordtotalsofar=$numrecordtotalsofar+$countrecord;
        
set_time_limit(0);
        
sleep(5);

        
$rawHTML fetchRawData($url,$search,$currentpagenumber,$totalpageint,$numrecordtotalsofar);
        return 
$data;
    }

The logic is first I retrieve the data on a page then putting it into an array after parsing it then initalise phpexcel to write the data from the array into excel then unset cURL and phpexcel and then move on to next page.

Sorry the code is a bit messy as I have tried so many modifications but still cant get it work. Please help me !