compare.php

<?php
$s1 = microtime(true);

for ($i = 0; $i < 20; $i++) {
    exec('php gapic.php');
}

print microtime(true) - $s1 . PHP_EOL;

$s2 = microtime(true);

for ($i = 0; $i < 20; $i++) {
    exec('php non-gapic.php');
}

print microtime(true) - $s2 . PHP_EOL;

gapic.php

<?php

require 'vendor/autoload.php';

use Google\Cloud\Logging\LoggingClient;

// This will choose the "gRPC" connection, which is really jut a GAPIC connection.
// To have the GAPIC use REST override this property to "rest": https://github.com/GoogleCloudPlatform/google-cloud-php/blob/master/Core/src/GrpcTrait.php#L105
$client = new LoggingClient([
    'transport' => 'grpc' 
]);
  
$client->logger('test_logs_gapic')->write(['some' => 'test data'], [
    'labels' => [
        'test' => 'label'
    ],
    'operation' => [
        'id' => 'myid'
    ],
    'httpRequest' => [
        'requestMethod' => 'GET'
    ]
]);

non-gapic.php

<?php

require 'vendor/autoload.php';

use Google\Cloud\Logging\LoggingClient;

$client = new LoggingClient([
    'transport' => 'rest'
]);

$client->logger('test_logs_non_gapic')->write(['some' => 'test data'], [
    'labels' => [
        'test' => 'label'
    ],
    'operation' => [
        'id' => 'myid'
    ],
    'httpRequest' => [
        'requestMethod' => 'GET'
    ]
]);