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";

?>

JavaScript

function calculateScore(name, pointsA, pointsB) {
    // Return length of name + both scores
    return name.length + pointsA + pointsB;
    }