PHP run a java program and get the output

Question

I have PHP that I am running with ajax. What I want to happen is the php executes a java program returns the output of said java program. Right now in my PHP file, as a test I am trying

exec("java -version", $output);
print_r($output);

However, this just prints to the console

Array
(
)

Also, when I add in my actual java program, it is outputting using System.out.println() if that makes a difference as to how it is read by PHP.

MihanEntalpo · Accepted Answer · 2017-12-24 17:24:37Z

1

As it states in http://php.net/manual/ru/function.shell-exec.php, you should:

$output = shell_exec('java -version');
print_r($output);

answered Dec 24, 2017 at 17:24

MihanEntalpo

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9 Comments

Cameron K Over a year ago

That just outputs an empty line.

MihanEntalpo Over a year ago

Ok, try this: print_r(shell_exec('echo 111')); What would it output ?

MihanEntalpo Over a year ago

@CameronK , ok, now run "java -version" in terminal without any additional environment changes. Just open new terminal window and run this command. What would it output?

Cameron K Over a year ago

java version "1.8.0_144" Java(TM) SE Runtime Environment (build 1.8.0_144-b01) Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

MihanEntalpo Over a year ago

Did you run php code through php-cli, or through some kind of web server (apache, phpfpm) ?

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