PHP Requires Chilkat v11.4.0+

Prevent JavaScript Infinite Loops

See more JavaScript Examples

Demonstrates how prevent infinite loops or prevent the JavaScript from running for a longer amount of time than allowed. Chilkat2 PHP

<?php

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

// This is the JavaScript we'll run:

// console.log('Starting infinite loop...'); while(true) {};

$sbScript = new StringBuilder();
$sbScript->Append('console.log(\'Starting infinite loop...\'); while(true) {};');

$js = new Js();

// Set a limit on the amount of time (in seconds) the script is allowed to run.
// If the JavaScript takes longer than this amount of time, then Chilkat kills the script without crashing the host program.
// The default value of TimeoutSeconds is 0, which indicates no limit.
// For this example, set a limit of 2 seconds.
$js->TimeoutSeconds = 2;

$result = new JsonObject();
$result->EmitCompact = false;

// Run the script..
try {
    $js->Eval($sbScript, $result);
} catch (\Chilkat2\Exception $e) {
    // Examine the result for an exception.
    echo $result->Emit(), "\n";

    // The result contains this:

    //     {
    //       "exception": {
    //         "message": "interrupted - JavaScript exceeded the Chilkat.Js.TimeoutSeconds",
    //         "stack": [
    //           {
    //             "func": "<eval>",
    //             "file": "<input>",
    //             "line": 1,
    //             "col": 8
    //           }
    //         ]
    //       }
    //     }

    // Also examine the LastErrorText.
    echo $e->getMessage(), "\n";
    exit;
}

// We should never get here..
echo "Succeeded.\n";
echo $result->Emit(), "\n";

JavaScript

console.log('Starting infinite loop...');
while(true) {};