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<?php |
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namespace Scientist; |
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use Scientist\Matchers\Matcher; |
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use Scientist\Matchers\StandardMatcher; |
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/** |
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* Class Experiment |
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* |
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* An experiment allows us to implement our code in a new way without |
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* risking the introduction of bugs or regressions. |
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* |
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* @package Scientist |
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*/ |
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class Experiment |
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{ |
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/** |
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* Experiment name. |
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* |
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* @var string |
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*/ |
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protected $name; |
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/** |
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* The control callback. |
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* |
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* @var callable |
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*/ |
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protected $control; |
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/** |
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* Trial callbacks. |
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* |
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* @var array |
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*/ |
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protected $trials = []; |
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/** |
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* Parameters for our callbacks. |
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* |
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* @var array |
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*/ |
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protected $params = []; |
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/** |
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* Laboratory instance. |
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* |
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* @var \Scientist\Laboratory |
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*/ |
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protected $laboratory; |
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/** |
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* Matcher for experiment values. |
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* |
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* @var \Scientist\Matchers\Matcher |
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*/ |
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protected $matcher; |
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/** |
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* Execution chance. |
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* |
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* @var integer |
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*/ |
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protected $chance = 100; |
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/** |
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* Create a new experiment. |
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* |
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* @param string $name |
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* @param \Scientist\Laboratory $laboratory |
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*/ |
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public function __construct($name, Laboratory $laboratory) |
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{ |
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$this->name = $name; |
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$this->laboratory = $laboratory; |
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$this->matcher = new StandardMatcher; |
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} |
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/** |
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* Fetch the experiment name. |
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* |
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* @return string |
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*/ |
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public function getName() |
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{ |
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return $this->name; |
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} |
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/** |
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* Retrieve the laboratory instance. |
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* |
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* @return \Scientist\Laboratory|null |
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*/ |
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public function getLaboratory() |
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{ |
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return $this->laboratory; |
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} |
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/** |
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* Register a control callback. |
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* |
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* @param callable $callback |
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* |
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* @return $this |
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*/ |
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public function control(callable $callback) |
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{ |
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$this->control = $callback; |
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return $this; |
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} |
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/** |
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* Fetch the control callback. |
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* |
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* @return callable |
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*/ |
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public function getControl() |
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{ |
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return $this->control; |
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} |
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/** |
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* Register a trial callback. |
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* |
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* @param string $name |
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* @param callable $callback |
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* |
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* @return $this |
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*/ |
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public function trial($name, callable $callback) |
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{ |
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$this->trials[$name] = $callback; |
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return $this; |
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} |
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/** |
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* Fetch a trial callback by name. |
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* |
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* @param string $name |
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* |
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* @return mixed |
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*/ |
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public function getTrial($name) |
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{ |
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return $this->trials[$name]; |
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} |
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/** |
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* Fetch an array of trial callbacks. |
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* |
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* @return array |
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*/ |
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public function getTrials() |
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{ |
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return $this->trials; |
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} |
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/** |
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* Set a matcher for this experiment. |
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* |
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* @param \Scientist\Matchers\Matcher $matcher |
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* |
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* @return $this |
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*/ |
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public function matcher(Matcher $matcher) |
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{ |
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$this->matcher = $matcher; |
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return $this; |
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} |
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/** |
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* Get the matcher for this experiment. |
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* |
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* @return \Scientist\Matchers\Matcher |
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*/ |
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public function getMatcher() |
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{ |
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return $this->matcher; |
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} |
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/** |
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* Set the execution chance. |
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* |
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* @param integer $chance |
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* |
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* @return $this |
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*/ |
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public function chance($chance) |
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{ |
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$this->chance = (int) $chance; |
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return $this; |
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} |
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/** |
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* Get the execution chance. |
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* |
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* @return integer |
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*/ |
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public function getChance() |
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{ |
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return $this->chance; |
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} |
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/** |
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* Determine whether an experiment should run based on chance. |
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* |
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* @return boolean |
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*/ |
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public function shouldRun() |
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{ |
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return rand(0, 100) <= $this->chance; |
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} |
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/** |
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* Get the experiment parameters. |
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* |
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* @return array |
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*/ |
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public function getParams() |
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{ |
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return $this->params; |
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} |
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/** |
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* Execute the experiment within the laboratory. |
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* |
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* @return mixed |
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*/ |
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public function run() |
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{ |
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$this->params = func_get_args(); |
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return $this->laboratory->runExperiment($this); |
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} |
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/** |
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* Execute the experiment and return a report. |
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* |
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* @return \Scientist\Report |
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*/ |
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public function report() |
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{ |
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$this->params = func_get_args(); |
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return $this->laboratory->getReport($this); |
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} |
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} |
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