<?php

use PhantomPdf/PdfGenerator;

$pdfGenerator = new PdfGenerator('/path/to/phantomjs-binary');

$htmlString = '<h1>Test Pdf</h1>';
$targetPath = '/path/to/target-file';

$pdfGenerator->renderFileFromHtml($htmlString, $targetPath);

<?php

use PhantomPdf/PdfGenerator;

$pdfGenerator = new PdfGenerator('/path/to/phantomjs-binary');

$options = new Options();

// Set margin (by default all widths are in cm)
$options->setMargin(1.5);
$options->setMargin(15, 'mm');

// Set orientation
$options->setOrientationPortrait();
// or
$options->setOrientationLandscape();

// Set Format
$options->setFormat('A5');

$pdfGenerator->renderFileFromHtml($htmlString, $targetPath, $options);

<?php

// Create a Header that appears on every page.
$options->setHeaderContent('<h1>Header</h1>');
$options->setHeaderHeight(3);

// Create a Footer for every page. 
$options->setFooterContent('<div>#pageNum / #totalPages</div>');
$options->setFooterHeight(2);

// Use custom Placeholder for PageNumber and TotalPageCount
$options->setPageNumPlaceholder('{{pageNum}}')
$options->setTotalPagesPlaceholder('{{totalPages}}')