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<?php /** * This file is part of the HTMLUnitTester package. * *	(c) Bruce Wells <brucekwells@gmail.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace PHPFUI\HTMLUnitTester; /** * Simple Throttle class. Call $throttle->delay() to wait the * minimum number of microseconds specified in the constructor. * * Default constructor does not result in any delay. */ class Throttle { private float $lastAccessed = 0.0; private float $microseconds = 0.0; /** * There are 1 million microsecond in a second. */ public function __construct(?int $microseconds = 0) { $this->lastAccessed = \microtime(true); if ($microseconds)	{ $this->microseconds = 1.0 / 1_000_000.0 * $microseconds;	}	} /** * Wait at least the number of microseconds since the last * delay call. */ public function delay() : void { if ($this->microseconds)	{	$now = \microtime(true);	$timeDifference = $now - $this->lastAccessed; if ($timeDifference < $this->microseconds)	{	\usleep((int)(($this->microseconds - $timeDifference) * 1_000_000.0));	} $this->lastAccessed = $now = \microtime(true);	}	}	}