(PHP Extension) Viewing a Simple Three-Step Execution Plan

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This example demonstrates a straightforward, valid dependency chain that results in a three-step execution plan. The goal is not to execute the requests, but to inspect how the plan is constructed using ExaminePlan.

The target curl command requires {{order_id}}. A helper function is defined to produce order_id, but it depends on customer_id. Another helper function produces customer_id, which depends on account_name.

Because account_name is provided as a known input, the dependency chain can be fully resolved:

• customer_id is obtained from account_name
• order_id is obtained from customer_id
• The target curl command uses order_id

When ExaminePlan is called, it builds and returns a three-step execution plan showing the order in which each function would be executed.

Note: This example requires Chilkat v11.5.0 or greater.

For more information, see https://www.chilkatsoft.com/curl_dependency_engine.asp

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<?php

include("chilkat.php");

$success = false;

$httpCurl = new CkHttpCurl();

// The target curl command requires {{order_id}}.
$targetCurl = 'curl -X GET https://api.example.com/orders/{{order_id}}';

// Define a helper function that produces order_id from customer_id.
$fnName = 'getOrderId';
$httpCurl->AddFunction($fnName,'curl -X GET https://api.example.com/order-id?customer={{customer_id}}');
$httpCurl->AddOutput($fnName,'order.id','order_id');

// Define a helper function that produces customer_id from account_name.
$fnName = 'getCustomerId';
$httpCurl->AddFunction($fnName,'curl -X GET https://api.example.com/customer-id?account={{account_name}}');
$httpCurl->AddOutput($fnName,'customer.id','customer_id');

// Provide the starting known input.
$httpCurl->SetVar('account_name','acme');

// Examine the execution plan without running any requests.
$planJson = new CkJsonObject();
$planJson->put_EmitCompact(false);

$success = $httpCurl->ExaminePlan($targetCurl,$planJson);

// Success is expected to be true.
print 'success = ' . $success . "\n";

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

// Expected result:
// 
// {
//   "plan": [{
//     "function": "getCustomerId",
//     "inputs": ["account_name"],
//     "outputs": ["customer_id"]
//   },{
//     "function": "getOrderId",
//     "inputs": ["customer_id"],
//     "outputs": ["order_id"]
//   },{
//     "function": "targetCurl",
//     "inputs": ["order_id"],
//     "outputs": []
//   }]
// }

?>