How give colour to a cell in pdf using php? - php

Question

I need to give color to a specific cell in pdf which is generated from my MySQL database, How to set the color to the specific value?
I have no clue about giving color to the specific value, I there any way help me out?
my pdf generate page is:
$fdate = date('Y-m-d H:i:s', strtotime($fromdate));
$tdate = date('Y-m-d H:i:s', strtotime( $todate));
/*$channelsCol = Channels::find()
->select(['channel_name'])
->where('DeviceRefID != :id',['id' => 0 ])
->orderBy('channel_no')
->all();*/
$channelscol = \Yii::$app->db
->createCommand("select channel_name from channels where deviceRefID !=0")
->queryAll();
$pdfpages = $this->getNoOfPdfs(count($channelscol));
$noOfPages = count($pdfpages[0]);
$collist=[];
$selectlist=[];
for($i=0; $i < $noOfPages;$i++)
{
$collist[$i] = 'Select SQL_BUFFER_RESULT "LogDateTime ",';
$selectlist[$i] = 'select LogDateTime,';
}
$count =0;
$counter=1;
for($i=0;$i<$noOfPages;$i++)
{
for($j=$pdfpages[0][$i];$j<$pdfpages[1][$i];$j++)
{
$collist[$i] = $collist[$i] . '"'.$channelscol[$j-1]['channel_name'] .'",';
$selectlist[$i] = $selectlist[$i] . 'Channel'.$j.'Value,';
$count = $count + 1;
}
}
for($i=0;$i <$noOfPages ;$i++)
{
$collist[$i] = rtrim($collist[$i],",");
$selectlist[$i] = rtrim($selectlist[$i],",");
}
//$path ="/var/www/devicesadmin/yii-app/web/devicelog/devicelog" . date("Y-m-d-H-i-s").".csv";
$logfilename =[];
$logfailure="";
for($i=0;$i < $noOfPages; $i++)
{
$logfilename[$i] = $pdfpages[2][$i] . date("Y-m-d-H-i-s") . mt_rand() . ".csv";
//$path ='D:/Raffi/ProjectsPhp/DevicesAdminProject/yii-app/web/devicelog//' . $logfilename[$i];
$path = "/var/www/devicesadmin/yii-app/web/devicelog/" . $logfilename[$i];
$export =' INTO OUTFILE "' . $path . '" FIELDS TERMINATED BY "," ENCLOSED BY \'"\' LINES TERMINATED BY \'\\n\' FOR UPDATE';
$whereclause = "where LogDatetime between '" . $fdate . "' and '" .$tdate ."'";
$finalsql = $collist[$i] . ' Union all ' .$selectlist[$i] .' From devicelog '. $whereclause . $export;
try {
Yii::$app->db->createCommand($finalsql)->execute();
//file_put_contents("D:\my.txt", $this->getHTML($path, $header));
//echo html($this->getHTML($path, $header));
//exit();
$pdf=new \PDF('P','mm','Legal');
$pdf->AliasNbPages();
//$pdf=new \PDF('L','mm','Legal',130);
$pdf->AddPage();
$pdf->SetFont('helvetica','',10);
$pdf->WriteHTML($this->getHTML($path));
$logfilename[$i] = "dl" . $pdfpages[2][$i] . date("Y-m-d-H-i-s").".pdf";
//$filename = "D:/Raffi/ProjectsPhp/DevicesAdminProject\yii-app\web\devicelog" . $logfilename[$i];
$filename = "/var/www/devicesadmin/yii-app/web/devicelog/" . $logfilename[$i];
$pdf->Output('F',$filename);
unset($pdf);
} catch(Exception $e) {
}
}
If a pdf is generated, I need to give red color to the values which are above 50. But I can't get the values and give color.