PhpSpreadsheet/samples/Basic/25_In_memory_image.php

<?php

use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Worksheet\MemoryDrawing;

require __DIR__ . '/../Header.php';

// Create new Spreadsheet object
$helper->log('Create new Spreadsheet object');
$spreadsheet = new Spreadsheet();

// Set document properties
$helper->log('Set document properties');
$spreadsheet->getProperties()->setCreator('Maarten Balliauw')
    ->setLastModifiedBy('Maarten Balliauw')
    ->setTitle('Office 2007 XLSX Test Document')
    ->setSubject('Office 2007 XLSX Test Document')
    ->setDescription('Test document for Office 2007 XLSX, generated using PHP classes.')
    ->setKeywords('office 2007 openxml php')
    ->setCategory('Test result file');

// Generate an image
$helper->log('Generate an image');
$gdImage = @imagecreatetruecolor(120, 20) or die('Cannot Initialize new GD image stream');
$textColor = imagecolorallocate($gdImage, 255, 255, 255);
imagestring($gdImage, 1, 5, 5, 'Created with PhpSpreadsheet', $textColor);

// Add a drawing to the worksheet
$helper->log('Add a drawing to the worksheet');
$drawing = new MemoryDrawing();
$drawing->setName('Sample image');
$drawing->setDescription('Sample image');
$drawing->setImageResource($gdImage);
$drawing->setRenderingFunction(MemoryDrawing::RENDERING_JPEG);
$drawing->setMimeType(MemoryDrawing::MIMETYPE_DEFAULT);
$drawing->setHeight(36);
$drawing->setWorksheet($spreadsheet->getActiveSheet());

// Save
$helper->write($spreadsheet, __FILE__, ['Xlsx', 'Html']);