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Simple enum class in php
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<?php | |
class Enum | |
{ | |
private $enumsList = array(); | |
private $reverseList = array(); | |
public function __construct(array $enums) | |
{ | |
$this->addEnums($enums); | |
} | |
public function reverse($value) | |
{ | |
unset($this->reverseList); | |
$this->reverseList = array(); | |
if($value != 0){ | |
while($value > 0) | |
{ | |
$lastNearestLowerEntry = $this->nearestLowerEntry($value); | |
$this->reverseList[] = $lastNearestLowerEntry['name']; | |
$value -= $lastNearestLowerEntry['value']; | |
} | |
return $this->reverseList; | |
} | |
else | |
{ | |
return null; | |
} | |
} | |
private function nearestLowerEntry($value) | |
{ | |
$lastEntry = $this->enumsList[0]; | |
foreach($this->enumsList as $key=>$data) | |
{ | |
if($data['value'] > $value && $lastEntry['value'] < $value) | |
{ | |
return $lastEntry; | |
} | |
else if($value > $data['value'] && !isset($this->enumsList[$key + 1]) OR $data['value'] == $value) | |
{ | |
return $data; | |
} | |
$lastEntry = $data; | |
} | |
} | |
private function addEnums(array $enums) | |
{ | |
$biggestPowOf2Value = -1; | |
foreach($enums as $data) | |
{ | |
$this->enumsList[] = array( | |
'name' => $data, | |
'value' => pow(2, $biggestPowOf2Value + 1), | |
); | |
$biggestPowOf2Value ++; | |
} | |
} | |
private function getPowOf2($entry) | |
{ | |
if(is_int($entry)){ | |
$number = 0; | |
$powOf2 = -1; | |
while($number < $entry) | |
{ | |
$powOf2 ++; | |
$number = pow(2, $powOf2); | |
} | |
return $powOf2; | |
} | |
} | |
} |
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<?php | |
require_once('Enum.class.php'); | |
// example with a colors of object | |
$characteristics = new Enum(array('blue', 'red', 'green')); | |
// Value of blue = 2^0 = 1 | |
// Value of red = 2^1 = 2 | |
// Value of green = 2^2 = 4 | |
// If my object is blue and red his value is 3 | |
$characteristicsOfMyObject = $characteristics->reverse(3); // return array | |
echo 'Colors of a object with a value equal to 3 : '; | |
foreach($characteristicsOfMyObject as $data) // writte red, blue | |
{ | |
echo '<br/>- '.$data; | |
} | |
// If my object is blue and red his value is 7 | |
$characteristicsOfMyObject = $characteristics->reverse(7); // return array | |
echo '<br/> <br/>Colors of a object with a value equal to 7 : '; | |
foreach($characteristicsOfMyObject as $data) // writte green, red, blue | |
{ | |
echo '<br/>- '.$data; | |
} |
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