PHP Extension

Call a JavaScript Function Returning an Integer

See more JavaScript Examples

Demonstrates how to call a JavaScript function that returns an integer. PHP Extension

<?php

include("chilkat.php");

$success = false;

// ----------------------------------------------------------------------------------
// The Javascript function called in this example is shown at the bottom of this page.
// -----------------------------------------------------------------------------------

// In this example, we'll load the Javascript function definition from a file.
// It doesn't need to come from a file.  It could just as easily be loaded from a string.
$sbScript = new CkStringBuilder();
$success = $sbScript->LoadFile('js_call_function.js','utf-8');
if ($success == false) {
    print $sbScript->lastErrorText() . "\n";
    exit;
}

// Note: Each instance of a Chilkat Js object automatically establishes
// its own internal runtime and context.  Applications do not need to explicitly create
// the JavaScript runtime or context.
$js = new CkJs();

$result = new CkJsonObject();
$result->put_EmitCompact(false);

// Call Eval to add the function (shown at the bottom of this page) to the context's global object
$success = $js->Eval($sbScript,$result);
if ($success == false) {
    // Examine the result for an exception.
    print $result->emit() . "\n";

    // Also examine the LastErrorText.
    print $js->lastErrorText() . "\n";
    exit;
}

print $result->emit() . "\n";

// The expected output is "undefined":

// {
//   "type": "undefined",
//   "value": "undefined"
// }

//    When Eval processes a script containing only a function declaration,
//    it successfully performs the action (the function becomes defined).
//    However, since the script consists of a statement that produces no value,
//    the script's overall completion value is empty. In JavaScript, the
//    absence of a value is represented by `undefined`.
// 
//    Therefore, the Eval call returns `undefined`.

// ------------------------------------------------------------------------------
// Call the function calculateScore("Player1", 10, 20)

$funcCall = new CkJsonObject();

// Create JSON defining the function call:

// {
//   "name": "calculateScore",
//   "args": [ "Player1", 10, 20 ]
// }

$funcCall->UpdateString('name','calculateScore');
$funcCall->UpdateString('args[0]','Player1');
$funcCall->UpdateInt('args[1]',10);
$funcCall->UpdateInt('args[2]',20);

$funcCall->put_EmitCompact(false);
print $funcCall->emit() . "\n";

$success = $js->CallFunction($funcCall,$result);
if ($success == false) {
    // Examine the result for an exception.
    print $result->emit() . "\n";

    // Also examine the LastErrorText.
    print $js->lastErrorText() . "\n";
    exit;
}

print $result->emit() . "\n";

// Output:

// {
//   "type": "int",
//   "value": 37
// }

$retval = $result->IntOf('value');
print 'retval = ' . $retval . "\n";

?>