(PHP Extension) Call a JavaScript Function Returning a Boolean

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Note: This example requires Chilkat v11.4.0 or greater.

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<?php

include("chilkat.php");

$success = false;

// This is the JavaScript function we'll call:

// function isEven(number) {
//     return number % 2 === 0;
// }

$sbScript = new CkStringBuilder();
$sbScript->Append('function isEven(number) { return number % 2 === 0; }');

$js = new CkJs();

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

// Call Eval to add the function 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;
}

// ------------------------------------------------------------------------------
// Call the function isEven(8)

$funcCall = new CkJsonObject();

// Create JSON specifying the function name and arguments

// {
//   "name": "isEven",
//   "args": [ 8 ]
// }

$funcCall->UpdateString('name','isEven');
$funcCall->UpdateInt('args[0]',8);

$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": "bool",
//   "value": true
// }

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

// Output:
// true

?>