Mike42\Escpos\Printer::setJustification PHP Method

    public function setJustification($justification = Printer::JUSTIFY_LEFT)
    {
        self::validateInteger($justification, 0, 2, __FUNCTION__);
        $this->connector->write(self::ESC . "a" . chr($justification));
    }

$printer -> setEmphasis(false);
foreach(array(16, 32, 64, 128, 255) as $spacing) {
    $printer -> setLineSpacing($spacing);
    $printer -> text("Spacing $spacing: The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog.\n");
}
$printer -> setLineSpacing(); // Back to default
*/
/* Stuff around with left margin */
$printer->setEmphasis(true);
$printer->text("Left margin\n");
$printer->setEmphasis(false);
$printer->text("Default left\n");
foreach (array(1, 2, 4, 8, 16, 32, 64, 128, 256, 512) as $margin) {
    $printer->setPrintLeftMargin($margin);
    $printer->text("left margin {$margin}\n");
}
/* Reset left */
$printer->setPrintLeftMargin(0);
/* Stuff around with page width */
$printer->setEmphasis(true);
$printer->text("Page width\n");
$printer->setEmphasis(false);
$printer->setJustification(Printer::JUSTIFY_RIGHT);
$printer->text("Default width\n");
foreach (array(512, 256, 128, 64) as $width) {
    $printer->setPrintWidth($width);
    $printer->text("page width {$width}\n");
}
/* Printer shutdown */
$printer->cut();
$printer->close();