性能分析器（Profiler）¶

<?php

function print_canonical($xhprof_data)
{
    if (!is_array($xhprof_data)) {
        throw new \UnexpectedValueException("print_canonical expects an array, but %s given.", gettype($xhprof_data));
    }

    ksort($xhprof_data);
    foreach($xhprof_data as $func => $metrics) {
        echo str_pad($func, 40) . ":";
        ksort($metrics);
        foreach ($metrics as $name => $value) {
            $value = str_pad($value, 4, " ", STR_PAD_LEFT);

            echo " {$name}={$value};";
        }
        echo "\n";
    }
}

function bar() {
    return 1;
}

function foo($x) {
    $sum = 0;
    for ($idx = 0; $idx < 2; $idx++) {
        $sum += bar();
    }
    return strlen("hello: {$x}");
}

Phalcon\Xhprof::enable(Phalcon\Xhprof::FLAG_MEMORY | Phalcon\Xhprof::FLAG_CPU);
foo("this is a test");
$output = Phalcon\Xhprof::disable();
print_canonical($output);

<?php

$profiler = new Phalcon\Profiler();

$profiler->startProfile('one');

$profile = $profiler->getCurrentProfile(); // 'one'
$profile = $profiler->getLastProfile(); // 'one'

$profiler->startProfile('two');

$profile = $profiler->getCurrentProfile(); // 'two'
$profile = $profiler->getLastProfile(); // 'two'

$profiler->stopProfile('two');

$num = count($profiler->getProfiles()); // 1
$profile = $profiler->getCurrentProfile(); // 'one'

$profile = $profiler->getLastProfile(); // 'two'

$profiler->stopProfile('one');
$num = count($profiler->getProfiles()); // 2

<?php

use Phalcon\DB\Profiler as DbProfiler;

$profiler = new DbProfiler();

// 设置性能分析组件
$connection->setProfile($profiler);

$sql = "SELECT buyer_name, quantity, product_name "
     . "FROM buyers "
     . "LEFT JOIN products ON buyers.pid = products.id";

// 执行SQL
$connection->query($sql);

// 获取最后一个分析结果
$profile = $profiler->getLastProfile();

echo "SQL Statement: ", $profile->getSQLStatement(), "\n";
echo "Start Time: ", $profile->getInitialTime(), "\n";
echo "Final Time: ", $profile->getFinalTime(), "\n";
echo "Total Elapsed Time: ", $profile->getTotalElapsedSeconds(), "\n";
echo "Total Usage Memory: ", $profile->getTotalUsageMemory(), "\n";

<?php

use Phalcon\Events\Manager as EventsManager;
use Phalcon\Db\Profiler as DbProfiler;

$eventsManager = new EventsManager();

$profiler = new DbProfiler();

// 监听所有数据库的事件
$eventsManager->attach('db', function ($event, $connection) use ($profiler) {
    if ($event->getType() == 'beforeQuery') {
        // 操作前启动分析
        $profiler->startProfile('db', ['sqlStatement' => $connection->getSQLStatement()]);
    }
    if ($event->getType() == 'afterQuery') {
        // 操作后停止分析
        $profiler->stopProfile();
    }
});

// 设置事件管理器
$connection->setEventsManager($eventsManager);

$sql = "SELECT buyer_name, quantity, product_name "
     . "FROM buyers "
     . "LEFT JOIN products ON buyers.pid = products.id";

// 执行SQL
$connection->query($sql);

// 获取最后一个分析结果
$profile = $profiler->getLastProfile();

echo "SQL Statement: ", $profile->getSQLStatement(), "\n";
echo "Start Time: ", $profile->getInitialTime(), "\n";
echo "Final Time: ", $profile->getFinalTime(), "\n";
echo "Total Elapsed Time: ", $profile->getTotalElapsedSeconds(), "\n";
echo "Total Usage Memory: ", $profile->getTotalUsageMemory(), "\n";