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<?php |
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namespace BenTools\StringCombinations; |
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use IteratorAggregate; |
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final class NoDuplicateLettersStringCombinations implements IteratorAggregate, StringCombinationsInterface |
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{ |
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/** |
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* @var StringCombinations |
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*/ |
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private $stringCombinations; |
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/** |
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* UniqueStringCombinations constructor. |
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*/ |
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public function __construct(StringCombinations $stringCombinations) |
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{ |
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$this->stringCombinations = $stringCombinations; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function getIterator() |
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{ |
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for ($i = $this->stringCombinations->min; $i <= $this->stringCombinations->max; $i++) { |
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foreach ($this->permute($this->stringCombinations->charset, $i) as $combination) { |
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yield implode($this->stringCombinations->glue, $combination); |
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} |
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} |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function count() |
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{ |
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$arr = []; |
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for ($pos = $this->stringCombinations->max, $i = 0; $pos >= $this->stringCombinations->min; $pos--, $i++) { |
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if (0 === $i) { |
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$arr[$i] = [$pos]; |
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} else { |
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$arr[$i] = array_merge($arr[$i - 1], [$pos]); |
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} |
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} |
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return array_sum(array_map('array_product', $arr)); |
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} |
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private function permute(array $charset, $length = null) |
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{ |
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$n = count($charset); |
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if (null === $length) { |
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$length = $n; |
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} |
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if ($length > $n) { |
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return; |
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} |
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$indices = range(0, $n - 1); |
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$cycles = range($n, $n - $length + 1, -1); |
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yield array_slice($charset, 0, $length); |
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if ($n <= 0) { |
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return; |
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} |
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while (true) { |
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$exitEarly = false; |
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for ($i = $length; $i--;) { |
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$cycles[$i]-= 1; |
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if ($cycles[$i] == 0) { |
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if ($i < count($indices)) { |
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$removed = array_splice($indices, $i, 1); |
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$indices[] = $removed[0]; |
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} |
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$cycles[$i] = $n - $i; |
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} else { |
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$j = $cycles[$i]; |
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$value = $indices[$i]; |
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$negative = $indices[count($indices) - $j]; |
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$indices[$i] = $negative; |
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$indices[count($indices) - $j] = $value; |
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$result = []; |
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$counter = 0; |
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foreach ($indices as $index) { |
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$result[] = $charset[$index]; |
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$counter++; |
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if ($counter == $length) { |
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break; |
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} |
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} |
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yield $result; |
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$exitEarly = true; |
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break; |
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} |
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} |
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if (!$exitEarly) { |
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break; |
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} |
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} |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function getRandomString() |
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{ |
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$charset = $this->stringCombinations->charset; |
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$string = []; |
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$length = random_int($this->stringCombinations->min, $this->stringCombinations->max); |
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for ($pos = 1; $pos <= $length; $pos++) { |
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shuffle($charset); |
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$string[] = array_shift($charset); |
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} |
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return implode($this->stringCombinations->glue, $string); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function asArray() |
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{ |
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return iterator_to_array($this); |
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} |
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} |
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Since your code implements the magic setter
_set
, this function will be called for any write access on an undefined variable. You can add the@property
annotation to your class or interface to document the existence of this variable.Since the property has write access only, you can use the @property-write annotation instead.
Of course, you may also just have mistyped another name, in which case you should fix the error.
See also the PhpDoc documentation for @property.