cli.php

<?php
require 'vendor/autoload.php';
require 'common.php';

use Google\Cloud\Bigtable\BigtableClient;

$bigtable = new BigtableClient();
$table = $bigtable->table('instanceId', 'tableId');

$keys = [];
$rows = $table->readRows([])->readAll();
foreach ($rows as $k => $row) {
    $keys[] = $k;
}
unset($bigtable);
unset($table);

$bigtable = new BigtableClient();
$table = $bigtable->table('instanceId', 'tableId');

for($i = 0; $i < 50; $i++) {
    $index = $keys[array_rand($keys)];
    $start = hrtime(true);
    $table->readRow($index);
    $end = hrtime(true);
    echo (($end - $start)/1000000),"ms\n";
}

read.go

package main

import (
	"context"
	"fmt"
	"math/rand"
	"time"

	"cloud.google.com/go/bigtable"
)

func readRow(table *bigtable.Table, ctx context.Context, index string) time.Duration {
	start := time.Now()
	_, err := table.ReadRow(ctx, index)
	if err != nil {
		panic(err)
	}
	end := time.Now()
	return end.Sub(start)
}

func main() {
	ctx := context.Background()

	client, err := bigtable.NewClient(ctx, "projectId", "instanceId")
	if err != nil {
		panic(err)
	}
	rr := bigtable.PrefixRange("")
	table := client.Open("tableId")
	keys := make([]string, 1)
	err = table.ReadRows(ctx, rr, func(r bigtable.Row) bool {
		keys = append(keys, r.Key())
		return true
	})
	if err != nil {
		panic(err)
	}
	keyCount := len(keys)
	for i := 0; i < 50; i++ {
		latency := readRow(table, ctx, keys[rand.Intn(keyCount)])
		fmt.Println(float64(latency.Microseconds()) / 1000)
	}
	client.Close()
}

web.php

<?php

require 'vendor/autoload.php';

use Google\Cloud\Bigtable\BigtableClient;

$start = hrtime(true);

$bigtable = new BigtableClient();
$table = $bigtable->table('instanceId', 'tableId');

$row = $table->readRow($_GET["key"]);

$end = hrtime(true);

echo (($end - $start)/1000000);