phpspreadsheet has the same writing speed

[JrDwarf]

I just tested with your library and phpspreadsheet to compare the speed of the writing of the excel with the 40k+ lines of row and 50 column of data.

Both takes about 23min, so i don't see any improvement for the library? Unless I'm doing it wrongly. Kindly provide any extra advice that I should know about. Thanks

        $excel = Excel::create(['Sheet1'], $temp_dir_array);
        $sheet = $excel->sheet();

        $sheet->setTopLeftCell('B2'); //start from B2

        //write the header, report name, gen date
        if (!empty($excel_data_array['report_header'])) {
            $report_header = $excel_data_array['report_header'];
            $merging_row_cell_count = 2; //header start on 2nd row
            foreach ($report_header as $row) {
                $sheet->writeRow($row)->mergeCells("B$merging_row_cell_count:E$merging_row_cell_count");
                //merge 3 column cells together
                $merging_row_cell_count++;
            }

            $sheet->skipRow(); // Skip a row
        }

        $headStyle = [
            'font' => [
                'style' => 'bold',
            ],
        ];

        //write the table header
        $table_header = $excel_data_array['table_header'];
        $sheet->writeRow($table_header, $headStyle)->applyBorder('thin')->applyTextAlign('center');

        // Assuming $table_header is an array containing headers up to max column
        // Set column width for columns C to the end column
        $end_column = count($table_header) + 2; // Add 2 to skip columns A and B
        for ($col = 3; $col <= $end_column; $col++) {
            $sheet->setColWidthAuto($col);
        }

        //write all td
        $table_data = $excel_data_array['table_data'];
        foreach($table_data as $row_data) {
            $sheet->writeRow($row_data)->applyBorder('thin')->applyTextAlign('center');
        }

[aVadim483]

I have laptop with i7-10510U CPU & 16 Gb RAM. I create Excel file 50 cols x 40k rows

elapsed time: 68.447 sec memory peak usage: 367001600 total rows: 40000 speed: 584.394 rows/sec

I took your code and skip report_header (I don't think it affects performance). And this code runs on my laptop in 68 seconds

<?php

require_once __DIR__ . '/vendor/autoload.php';
require_once __DIR__ . '/src/autoload.php';

function randStr($maxLen)
{
    static $chars = 'abcdefghijklmnopqrstuvwxyz0123456789 ';

    $result = '';
    $len = random_int(1, $maxLen);
    for ($j = 0; $j < $len; $j++) {
        $result .= $chars[mt_rand() % 36];
    }

    return $result;
}

// fill $excel_data_array - 50 cols & 40k rows
$excel_data_array = [
    'table_header' => [],
    'table_data' => [],
];

$maxCol = 50;
$maxRow = 40000;

for ($col = 0; $col < $maxCol; $col++) {
    if ($col === 0) {
        $excel_data_array['table_header'][] = 'row';
    }
    else {
        $excel_data_array['table_header'][] = randStr(10);
    }
}
for ($row = 0; $row < $maxRow; $row++) {
    for ($col = 0; $col < $maxCol; $col++) {
        if ($col === 0) {
            $excel_data_array['table_data'][$row][] = $row + 1;
        }
        else {
            $excel_data_array['table_data'][$row][] = randStr(10);
        }
    }
}
$outFileName = __DIR__ . '/50-40k.xlsx';

// ++++++++++
// start point here

$timer = microtime(true);

$excel = \avadim\FastExcelWriter\Excel::create(['Sheet1']);
$sheet = $excel->sheet();

$sheet->setTopLeftCell('B2'); //start from B2

$headStyle = [
    'font' => [
        'style' => 'bold',
    ],
];

//write the table header
$table_header = $excel_data_array['table_header'];
$sheet->writeRow($table_header, $headStyle)->applyBorder('thin')->applyTextAlign('center');

// Assuming $table_header is an array containing headers up to max column
// Set column width for columns C to the end column
$end_column = count($table_header) + 2; // Add 2 to skip columns A and B
for ($col = 3; $col <= $end_column; $col++) {
    $sheet->setColWidthAuto($col);
}

//write all td
$table_data = $excel_data_array['table_data'];
foreach($table_data as $row_data) {
    $sheet->writeRow($row_data)->applyBorder('thin')->applyTextAlign('center');
}
$excel->save($outFileName);

$time = round(microtime(true) - $timer, 3);

echo '<b>', basename(__FILE__, '.php'), "</b><br>\n<br>\n";
echo 'out filename: ', $outFileName, "<br>\n";
echo 'elapsed time: ', $time, ' sec', "<br>\n";
echo 'memory peak usage: ', memory_get_peak_usage(true), "<br>\n";
echo 'total rows: ', $maxRow, "<br>\n";
echo 'speed: ', round($maxRow / $time, 3), " rows/sec<br>\n";

You can take just my code and check how long it will take for you to execute