PHP: Basic usage for LuaSandbox

Basic usage for LuaSandbox

Once you've compiled PHP with LuaSandbox support, you can begin using LuaSandbox to safely run user-provided Lua code.

Example #1 Execute some Lua code

<?php

$sandbox = new LuaSandbox;
$sandbox->setMemoryLimit( 50 * 1024 * 1024 );
$sandbox->setCPULimit( 10 );

/ Register some functions in the Lua environment

function frobnosticate( $v ) {
    return [ $v + 42 ];
}

$sandbox->registerLibrary( 'php', [
    'frobnosticate' => 'frobnosticate',
    'output' => function ( $string ) {
        echo "$string\n";
    },
    'error' => function () {
        throw new LuaSandboxRuntimeError( "Something is wrong" );
    }
] );

/ Execute some Lua code, including callbacks into PHP and into Lua

$luaCode = <<<EOF
php.output( "Hello, world" );

return "Hi", function ( v )
    return php.frobnosticate( v + 200 )
end
EOF;

list( $hi, $frob ) = $sandbox->loadString( $luaCode )->call();
assert( $frob->call( 4000 ) === [ 4242 ] );

/ PHP-thrown LuaSandboxRuntimeError exceptions can be caught inside Lua

list( $ok, $message ) = $sandbox->loadString( 'return pcall( php.error )' )->call();
assert( !$ok );
assert( $message === 'Something is wrong' );

?>

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