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<?php

/**

* Copyright 2018 Google Inc.

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

require_once __DIR__ . '/vendor/autoload.php';

use OpenCensus\Trace\Exporter\NullExporter;

# [START trace_setup_php_use_statement]

use OpenCensus\Trace\Exporter\StackdriverExporter;

use OpenCensus\Trace\Tracer;

# [END trace_setup_php_use_statement]

$projectId = getenv('GOOGLE_PROJECT_ID');

if ($projectId === false) {

die('Set GOOGLE_PROJECT_ID envvar');

}

# [START trace_setup_php_exporter_setup]

$exporter = new StackdriverExporter([

'clientConfig' => [

'projectId' => $projectId

]

]);

# [END trace_setup_php_exporter_setup]

// When running tests, use a null exporter instead.

if (getenv('USE_NULL_EXPORTER')) {

$exporter = new NullExporter();

}

# [START trace_setup_php_tracer_start]

Tracer::start($exporter);

# [END trace_setup_php_tracer_start]

function trace_callable()

{

# [START trace_setup_php_span_with_closure]

Tracer::inSpan(

['name' => 'slow_function'],

function () {

sleep(1);

}

);

# [END trace_setup_php_span_with_closure]

}