```php

require_once 'src/PhpOffice/PhpPresentation/Autoloader.php';

\PhpOffice\PhpPresentation\Autoloader::register();

use PhpOffice\PhpPresentation\PhpPresentation;

use PhpOffice\PhpPresentation\Style\Color;

use PhpOffice\PhpPresentation\Style\Fill;

// 創(chuàng)建個(gè)新的PPT對(duì)象

$presentation = new PhpPresentation();

// 添加新的幻燈片

$slide = $presentation->getSlides()->createSlide();

$slide->addTitle('Hello World!');

$slide->addSubtitle('This is my first presentation created with PHPPowerPoint');

// 設(shè)置背景顏色為紅色

$fill = Fill::createFill('solid', Color::createFromHex('FF'));

$shape = $slide->createDrawingShape();

$shape->setName('Rectangle');

$shape->setDescription('');

$shape->setFill($fill);

$shape->setOffsetX();

$shape->setOffsetY();

$shape->setHeight();

$shape->setWidth();

// 保存PPT文件

$objWriter = \PhpOffice\PhpPresentation\IOFactory::createWriter($presentation, 'PowerPoint');

$objWriter->save('helloWorld.pptx');

```

至于通信業(yè)、智慧水務(wù)、農(nóng)業(yè)等行業(yè)如何利用PHP顯示PPT文件，這主要取決于您的具體需求。在通信業(yè)中，您使用PHP顯示關(guān)于新產(chǎn)品的演示文稿；在智慧水務(wù)中，您使用PHP顯示水處理設(shè)備的操作手冊(cè)；在農(nóng)業(yè)中，您使用PHP顯示農(nóng)作物種植技術(shù)的教學(xué)材料等。