Java to php compiler

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php-java/php-java

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feat: Support Java classes v56 (Java 12) to v63 (Java 19)

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README.md

PHPJava is an experimental library which emulates JVM (a.k.a. Java Virtual Machine) and compiling intermediate code by PHP 🐘 And PHPJava reads binary from pre-compiled Java file(s) ☕ So, PHPJava is NOT bridge to Java. This library can be run 100% in PHP. This project referred to Java Virtual Machine Specification documentation at the time we made it.

We are welcoming any contributions to this project 💪

Contribution guide is here:

The Intermediate Code Compiler

The JVM language of PHP syntax

You can run PHPJava as same as an executable binary.

./vendor/bin/PHPJava HelloWorld

./vendor/bin/PHPJava HelloWorld.class

./vendor/bin/PHPJava -m jar HelloWorld.jar

$ composer require php-java/php-java:dev-master 

class HelloWorld < public static void main(String[] args) < System.out.println(args[0]); > >

$ javac -encoding UTF8 /path/to/HelloWorld.java 

 use PHPJava\Core\JavaClass; use PHPJava\Core\Stream\Reader\FileReader; JavaClass::load('HelloWorld') ->getInvoker() ->getStatic() ->getMethods() ->call( 'main', ["Hello World!"] ); // Or, you can specify file path as follows. (new JavaClass(new JavaCompiledClass(new FileReader('/path/to/HelloWorld.class')))) ->getInvoker() ->getStatic() ->getMethods() ->call( 'main', ["Hello World!"] );

$ php /path/to/HelloWorld.php Hello World! 

Java Archive (Execute *.jar file)

$ javac -encoding UTF8 -d build src/* $ cd build && jar -cvfe ../Test.jar Test * 

 use PHPJava\Core\JavaArchive; // You must pass parameters to entrypoint within the `execute` method. // The `execute` method does not have any default parameters. (new JavaArchive('Test.jar'))->execute([]); // or (new JavaArchive('Test.jar')) ->getClassByName('Test') ->getInvoker() ->getStatic() ->getMethods() ->call( 'main', [] );

e.g., Set or Get static fields:

 use PHPJava\Core\JavaClass; use PHPJava\Core\Stream\Reader\FileReader; $staticFieldAccessor = JavaClass::load('HelloWorld') ->getInvoker() ->getStatic() ->getFields(); // Set $staticFieldAccessor->set('fieldName', 'value'); // Get echo $staticFieldAccessor->get('fieldName');

 use PHPJava\Core\JavaClass; use PHPJava\Core\Stream\Reader\FileReader; JavaClass::load('HelloWorld') ->getInvoker() ->getStatic() ->getMethods() ->call( 'methodName', $firstArgument, $secondArgument, $thirdArgument, . ); // Or, if the called method has a return value, you can store it to a variable. $result = JavaClass::load('HelloWorld') ->getInvoker() ->getStatic() ->getMethods() ->call( 'methodWithSomethingReturn', $firstArgument, $secondArgument, $thirdArgument, . ); // Output the $result you want echo $result;

If you want to get/set dynamic fields, you need to call the construct method on Java by PHPJava.

 use PHPJava\Core\JavaClass; use PHPJava\Core\Stream\Reader\FileReader; $javaClass = JavaClass::load('HelloWorld'); $javaClass->getInvoker()->construct(); $dynamicFieldAccessor = $javaClass ->getInvoker() ->getDynamic() ->getFields(); // Set $dynamicFieldAccessor->set('fieldName', 'value'); // Get echo $dynamicFieldAccessor->get('fieldName');

If you want to call a dynamic method (same as a field), you need to call the construct method on Java by PHPJava.

 use PHPJava\Core\JavaClass; use PHPJava\Core\Stream\Reader\FileReader; $dynamicMethodAccessor = JavaClass::load('HelloWorld') ->getInvoker() ->construct() ->getDynamic() ->getMethods(); $dynamicMethodAccessor ->call( 'methodName', $firstArgument, $secondArgument, $thirdArgument, . ); // Or, if the called method has a return value, you can store it to a variable. $dynamicMethodAccessor ->call( 'methodWithSomethingReturn', $firstArgument, $secondArgument, $thirdArgument, . ); // Output the $result you want echo $result;

Call a method in a built-in package on Java

PHPJava can call a built-in package in the same way as JavaClass::load after the version 0.0.8.5. This feature is emulated by ReflectionClass on PHP and any static methods/fields will dynamically be generated in fact.

e.g.) To Call java.lang.Math is below.

 use PHPJava\Core\JavaClass; use PHPJava\Core\Stream\Reader\FileReader; echo JavaClass::load('java.lang.Math') ->getInvoker() ->getStatic() ->getMethods() ->call( 'pow', 2, 4 );

The example will return 16 .

Call ambiguous methods in Java from PHP

• In PHP, types are more ambiguous than Java.
• For example, you may want to call a method that accepts a long parameter in Java from PHP. In this case, you can call that method as follows:

e.g., [Recommended] Wrap with \PHPJava\Kernel\Types\Long_ .

class Test < public static void includingLongTypeParameter(long n) < System.out.println(n); > >

 $javaClass->getInvoker()->getStatic()->getMethods()->call( 'includingLongTypeParameter', new \PHPJava\Kernel\Types\Long_ (1234) );

The example will return 1234 .

e.g., Set false to strict mode option.

 use PHPJava\Core\JavaClass; use PHPJava\Core\Stream\Reader\FileReader; $javaClass = JavaClass::load( 'HelloWorld', [ 'strict' => false, ] );

 use PHPJava\Core\JavaClass; use PHPJava\Core\Stream\Reader\FileReader; $javaClass = JavaClass::load( 'HelloWorld', [ 'max_stack_exceeded' => 12345, 'validation' => [ 'method' => [ 'arguments_count_only' => true, ], ], ] );

 use PHPJava\Core\JVM\Parameters\GlobalOptions; use Monolog\Logger; GlobalOptions::set([ 'log' => [ 'level' => Logger::DEBUG, ], 'validation' => [ 'method' => [ 'arguments_count_only' => true, ], ], ]);

Output PHPJava operations

 use PHPJava\Core\JavaClass; use PHPJava\Core\Stream\Reader\FileReader; $javaClass = JavaClass::load('HelloWorld'); $javaClass ->getInvoker() ->getStatic() ->getMethods() ->call( 'main', ["Hello", 'World'] ); // Show debug traces. $javaClass->debug();

[method] public static void main(java.lang.String[]) [code]                            [executed] PC | OPCODE | MNEMONIC | OPERANDS | LOCAL STORAGE ---------+--------+----------------------+------------+----------------- 0 | 0xB2 | getstatic | 0 | 1 3 | 0x2A | aload_0 | 1 | 1 4 | 0x03 | iconst_0 | 2 | 1 5 | 0x32 | aaload | 3 | 1 6 | 0xB6 | invokevirtual | 2 | 1 9 | 0xB2 | getstatic | 0 | 1 12 | 0x2A | aload_0 | 1 | 1 13 | 0x04 | iconst_1 | 2 | 1 14 | 0x32 | aaload | 3 | 1 15 | 0xB6 | invokevirtual | 2 | 1 18 | 0xB2 | getstatic | 0 | 1 21 | 0x2A | aload_0 | 1 | 1 22 | 0x05 | iconst_2 | 2 | 1 23 | 0x32 | aaload | 3 | 1 24 | 0xB6 | invokevirtual | 2 | 1 27 | 0xB1 | return | 0 | 1 ---------+--------+----------------------+------------+----------------- 

• [method] shows the called method.
• [code] shows the JVM’s real programs.
• [executed] shows the executed programs.
  • PC shows the Program Counter.
  • OPCODE shows the Operation Codes.
  • MNEMONIC shows the names of the Operation Codes.
  • OPERANDS shows the stacked items on memory.
  • LOCAL STORAGE shows the stacked items on a method.

  About big number calculation

  • In normally, PHP cannot calculate big numbers as such as long and double types. But, PHPJava uses external Math library for covering above problems. And, PHPJava to use Java’s type as below comparison table. Therefore, we recommend to cast them to string on PHPJava. And, if it can be calculated with 64-bitPHP, PHPJava uses PHP’s arithmetic operations.

  Run Kotlin on the PHPJava

  Do you wanna run Kotlin on the PHPJava? Are you serious? Haha, yes, you can, but this feature is currently experimental.

  fun main(args: ArrayString>) < println("Hello World!") >

  $ kotlinc HelloWorld.kt -include-runtime -d HelloWorld.jar 

   use PHPJava\Core\JavaArchive; $jar = new JavaArchive(__DIR__ . '/HelloWorld.jar'); $jar->execute([]);

  You’ll get the result: Hello World! .

  $ ./vendor/bin/phpunit tests/Cases 

  $ ./vendor/bin/phpcs --standard=phpcs.xml src 

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  bafolts/java2php

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  README.md

  Java is a beautiful programming language — PHP is not. The compiled features of Java make maintaining the source code and extending functionality must simpler than PHP. The problem is that not all cheap web hosting companies currently provide a way to run Java code on their servers. The goal of this project is to provide a way for basic websites with minimal server side logic to run on hosting platforms that can only run PHP. Although it is only intended to be used for basic websites which need to run in PHP, this isn’t to say that the project will not attempt to provide a complete java to php translation. Besides threading, or other very complicated features of java, most basic features should translate fine. If your java code compiles given the included java.* library that the translator supports then your PHP should work as the Java did. The compiler will throw warnings in cases where the PHP equivalent is not supported.

  You will need Maven to compile and run the provided example HelloWorld Servlet.

  • Windows users can compile the example quickly with the runExample batch script.
  • Linux users can compile the example quickly with the runExample shell script.

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