There are two possible ways to bridge PHP and Java: you can either integrate PHP into a Java Servlet environment, which is the more stable and efficient
solution, or integrate Java support into PHP. The former is provided by a SAPI module that interfaces with the Servlet server, the latter by this Java extension.
The Java extension provides a simple and effective means for creating and invoking methods on Java objects from PHP. The JVM is created using JNI, and everything runs in-process.
This extension is EXPERIMENTAL. The behaviour of this extension -- including the names of its functions and anything else documented about
this extension -- may change without notice in a future release of PHP. Use this extension at your own risk.
In PHP 4 this PECL extensions source can be found in the ext/ directory within the PHP source or at the PECL link above. In order to use these functions you must compile PHP with Java support by using the --with-java[=DIR] where DIR points to the base
install directory of your JDK. This extension can only be built as a shared extension. Additional build extensions can be found in php-src/ext/java/README.
Windows users will enable php_java.dll inside of php.ini in order to use these functions. In PHP 4 this DLL
resides in the extensions/ directory within the PHP Windows binaries download. You may download this PECL extension DLL from the
PHP Downloads page or at
Note: In order to enable this module on a Windows environment with PHP <= 4.0.6, you must make jvm.dll available to your systems PATH. No additional DLL is
needed for PHP versions > 4.0.6.
new Java() will create an instance of a class if a suitable constructor is available. If no parameters are passed and the default constructor is useful as it provides
access to classes like java.lang.System which expose most of their functionallity through static methods.
Accessing a member of an instance will first look for bean properties then public fields. In other words, print $date.time will first attempt to be resolved as
$date.getTime(), then as $date.time.
Both static and instance members can be accessed on an object with the same syntax. Furthermore, if the java object is of type java.lang.Class, then static members of
the class (fields and methods) can be accessed.
Exceptions raised result in PHP warnings, and NULL results. The warnings may be eliminated by prefixing the method call with an "@" sign. The following APIs may be
used to retrieve and reset the last error:
Overload resolution is in general a hard problem given the differences in types between the two languages. The PHP Java extension employs a simple, but fairly effective, metric for determining
which overload is the best match.
Additionally, method names in PHP are not case sensitive, potentially increasing the number of overloads to select from.
Once a method is selected, the parameters are coerced if necessary, possibly with a loss of data (example: double precision floating point numbers will be converted to boolean).
In the tradition of PHP, arrays and hashtables may pretty much be used interchangably. Note that hashtables in PHP may only be indexed by integers or strings; and that arrays of primitive types in
Java can not be sparse. Also note that these constructs are passed by value, so may be expensive in terms of memory and time.
The Java Servlet SAPI builds upon the mechanism defined by the Java extension to enable the entire PHP processor to be run as a servlet. The primary advantage of this from a PHP perspective is
that web servers which support servlets typically take great care in pooling and reusing JVMs. Build instructions for the Servlet SAPI module can be found in php4/sapi/README. Notes:
While this code is intended to be able to run on any servlet engine, it has only been tested on Apache's Jakarta/tomcat to date. Bug reports, success stories and/or patches required to get this
code to run on other engines would be appreciated.
PHP has a habit of changing the working directory. sapi/servlet will eventually change it back, but while PHP is running the servlet engine may not be able to load any classes from the CLASSPATH
which are specified using a relative directory syntax, or find the work directory used for administration and JSP compilation tasks.