PHP code can run on the Java Virtual Machine using implementations like P8 that compile PHP to Java bytecode. This allows PHP applications to leverage Java libraries and PHP scripts to be used in Java applications and middleware products from IBM like WebSphere and Message Broker. Some challenges of PHP on JVM include differences in strings and limitations of PHP class formats, but it provides benefits like a more modern runtime and ability to integrate PHP and Java code.

1.
PHP on Java
Robin Fernandes (ibm)
[email_address]
@rewbs

2.
PHP ?
“ PHP isn't so much a language as a virtual explosion at the keyword and function factory .”
- Jeff Atwood
from “PHP sucks, but it doesn't matter”

3.
PHP ?
in_array( $needle , $haystack );
strpos( $haystack , $needle );
...
IteratorIterator
RecursiveIterator
RecursiveIteratorIterator
...
strip _ tags()
strip s lashes()
SDO _ Model _ Property::get C ontaining T ype()
ReflectionClass::isItera tea ble()

4.
PHP !
tiobe.com

5.
PHP !
Photo by Michelangelo van Dam ( DragonBe )

6.
PHP !

7.
Why integrate PHP and Java?
PHP Developers to grow from 3 to 5.5 million by 2013
PHP Developers in Corporate IT to grow from 13% to 60% by 2013
“ Pay special attention to opportunities to use PHP in combination with Java development efforts”
- Gartner

8.
Why run PHP on the JVM ?
PHP is a powerful and pragmatic language with a strong user-base
The Java Virtual Machines is a cutting edge language runtime
PHP + JVM = ♥

9.
How PHP runs on the JVM
<?php
echo 'hello' ;
System. out .println( &quot;hello&quot; );

10.
How PHP runs on the JVM
P8: a PHP 5.2 runtime implemented in Java
Runs on any Java 5+ JDK
Extensibility
XAPI-C for existing C extensions
XAPI-J for new Java extensions
(extension language choice is opaque to scripts)
Debug via DBGp using Eclipse PDT
P8 Runtime
SAPI-J
Parser
Interpreter
P8 Engine
Java
Extensions
C
Extensions
Stack
Resources
Classes
Objects
Variables
AST
XAPI-J
XAPI-C
Native
code
Compiler
.class
opcodes
Cache
Persistent
class cache
Debug API (DBGp)
Runtime

11.
Some Code !
<?php
java_import( &quot;java.util.HashMap&quot; );
$map = new HashMap;
$map ->put( &quot;stuff&quot; , array ( 1 , 2 , 3 , 4 , 5 ));
var_dump( $map ->get( &quot;stuff&quot; ));
// prints: array(5) { ...

12.
Some more Code !
<?php
java_import( &quot;java.io.File&quot; );
class SubFile extends File {
function isThisCool() {
return TRUE ; // Way cool
}
}
$file = new SubFile( &quot;/&quot; );
var_dump( $file ->isDirectory());
var_dump( $file ->isThisCool());

13.
Some more Code !
<?php
java_import( &quot;java.util.ArrayList&quot; );
$list = new ArrayList();
$list ->add( &quot;Hello World!&quot; );
$list ->add( FALSE );
$list ->add( 1234567890 );
foreach ( $list as $key => $value ) {
echo &quot; $key $value \n&quot; ;
}

14.
PHP on Java: Challenges
PHP has no language specification!
-> Write tests & contribute them back to php.net
Keeping up-to-date with php.net
-> As above!
Strings: byte array vs java.lang.String
-> Use byte arrays, convert sparingly.
Class format limitations
-> Use both compilation and interpretation.

15.
PHP on Java: Challenges
Extension functions & symbol tables
✔
✔
✘
✘
function f() {
$a = 1 ;
return $a ;
}
echo f(); //1
function f( $name ) {
$a = 1 ;
$ $name = 2 ;
return $a ;
}
echo f( 'a' ); //2
function f() {
$a = 1 ;
extract( array ( 'a' => 3 ));
return $a ;
}
echo f(); //3
function f() {
$a = 1 ;
print_r( array ( 'a' => 3 ));
return $a ;
}
echo f(); //3

16.
PHP apps + Java libraries
For example...
SugarCRM + Apache POI
Drupal + Eclipse BIRT
PhpBB + Apache Lucene

17.
Java apps + PHP scripting
For example...

18.
PHP in WebSphere sMash
Build Web apps quickly and easily
in Java , Groovy and PHP .
Lightweight web app runtime
Browser-based development tooling
Try it now: http://bit.ly/ibmCloud
JVM
Web Server
Application Code
Language Runtimes

19.
One more bit of Code !
class Dynamic {
def storage = [:]
def invokeMethod(String name, args) {
println &quot;Hello!&quot;
}
def getProperty(String name) {
storage[name]
}
def setProperty(String name, value) {
storage[name] = value
}
}
<?php
groovy_import( &quot;dynamic.groovy&quot; );
$foo = new Dynamic();
$foo ->bar();
$foo ->guff = &quot;Hello World!&quot; ;
echo $foo ->guff;

20.
PHP in Message Broker
Message Broker “ connects anything to anything ”
Routes and transforms data along the way
Use graphical mapping, XSLT, ESQL, Java and now PHP !
With PHP, use a SimpleXML-inspired syntax to easily manipulate XML message formats.

21.
PHP in CICS
Build RESTful services
based on CICS assets using PHP
Transaction Server
CICS assets:
RESTful API
to CICS assets
SupportPac CA1S
...
DB2
COBOL
Java

22.
Learn more & Try it out:
Thanks!
[email_address] / @rewbs
http://projectzero.org/php
http://bit.ly/ibmCloud