Quercus: Bring Java's Power to Your PHP Development (and Vice Versa)
Integrating Java Libraries
As was demonstrated with the previous example, Quercus' syntax is identical to that found in the native distribution. Go ahead and execute a few other PHP functions within the script for good measure. Additionally, Quercus supports the Java
import statement, which allows you to import Java libraries into your PHP scripts and then use PHP's object-oriented syntax to integrate those libraries into your code. Perhaps the easiest example involves using Java's
<?php import java.util.Calendar; $calendar = Calendar::getInstance(); echo $calendar->get(Calendar::YEAR); ?>
Executing this example produces the following output:
Calendarclass features are made available to PHP and accessible through PHP's native object-oriented syntax. This means that while you won't be able to copy native Java code directly into your PHP scripts, in cases such as this the changes really are minimal.
Integrating PHP with iText
Of course, PHP already offers pretty capable date- and time-related features of its own through the DateTime extension. So let's consider another example, this time implementing a feature that PHP alone is incapable of easily accomplishing.
iText PDF is a powerful open source Java library capable of generating and manipulating PDFs in ways that rival the most sophisticated commercial solutions. While PHP has long offered a capable PDF extension, this extension lacks features such as the ability to add watermarks and encryption, two features that are available to iText users. Using Quercus it's trivial to take advantage of iText within your PHP applications!
Begin by downloading the iText JAR file from itextpdf.com and saving it within your Java installation's class path. From there it's just a matter of importing a few native and iText-specific class libraries into your PHP script and then taking advantage of the iText API to create a PDF, as demonstrated here:
<?php import java.io.*; import com.itextpdf.text.*; import com.itextpdf.text.Document; import com.itextpdf.text.pdf.PdfWriter; $d = new Document(PageSize::A4); $fos = new FileOutputStream("/home/wjgilmore/src/resin-4.0.9/webapps/ROOT/pdfs/test.pdf"); $pdf = PdfWriter::getInstance($d, $fos); $d->open(); $p = new Paragraph("Quercus is really cool."); $d->add($p); $d->close(); ?>
Run this script on your Resin server (changing the path passed to the
FileOutputStream constructor), and a PDF containing the paragraph will be saved to your server! From there it would be easy to use native PHP code to make the newly generated PDF available to the user.
PHP and Java both sport massive libraries. When combined it seems there's nothing this duo couldn't accomplish. Are you using Quercus within your own applications? If so, tell us about your experiences in the comments!
About the Author
Jason Gilmore is is the founder of the publishing and consulting firm WJGilmore.com. He is the author of several popular books, including "Easy PHP Websites with the Zend Framework", "Easy PayPal with PHP", and "Beginning PHP and MySQL, Third Edition". Follow him on Twitter at @wjgilmore.
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