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syntax 
Cronómetro
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Cronómetro

Otra herramienta útil es el cronómetro del depurador con una precisión de microsegundos:

Debugger::timer();

// sweet dreams my cherrie
sleep(2);

$elapsed = Debugger::timer();
// $elapsed = 2

Se pueden realizar varias mediciones a la vez mediante un parámetro opcional.

Debugger::timer('page-generating');
// some code

Debugger::timer('rss-generating');
// some code

$rssElapsed = Debugger::timer('rss-generating');
$pageElapsed = Debugger::timer('page-generating');

Debugger::timer(); // runs the timer

... // some time-consuming operation

echo Debugger::timer(); // elapsed time in seconds