PHP Requires Chilkat v11.4.0+

Eval JavaScript Returning Int

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Demonstrates getting the completion value of a JavaScript that returns an integer. Chilkat2 PHP

<?php

use Chilkat2\Js;
use Chilkat2\JsonObject;
use Chilkat2\StringBuilder;

// This example demonstrates getting the completion value of a script,
// where the last evaluated expression is an integer.

// The Javascript run in this example is shown below.

// Load the JavaScript from a file.
$sbScript = new StringBuilder();
try {
    $sbScript->LoadFile('js_eval_return_int.js', 'utf-8');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$js = new Js();
$result = new JsonObject();

// Run the JavaScript
// Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
// In this case, the last evaluated expression is an int.
try {
    $js->Eval($sbScript, $result);
} catch (\Chilkat2\Exception $e) {
    echo $sbScript->LastErrorText, "\n";
    exit;
}

$result->EmitCompact = false;
echo $result->Emit(), "\n";

// Output:

// {
//   "type": "int",
//   "value": 42
// }

JavaScript

const base = 10;
const multiplier = 4;
const offset = 2;

// The last line is a calculation resulting in an integer
// Returns 42.
(base * multiplier) + offset;