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<?php |
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namespace Didatus\TextCaptcha\Generator; |
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use Didatus\TextCaptcha\TextCaptcha; |
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use Symfony\Component\Translation\Translator; |
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class Arithmetical implements GeneratorInterface |
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{ |
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private $translator; |
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private $numbers = [ |
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'zero', |
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'one', |
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'two', |
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'three', |
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'four', |
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'five', |
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'six', |
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'seven', |
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'eight', |
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'nine', |
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]; |
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private $arithemticalFunctions = [ |
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'+' => 'plus', |
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'-' => 'minus', |
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]; |
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private $captcha; |
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public function __construct(Translator $translator) |
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{ |
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$this->translator = $translator; |
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} |
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public function getTextCaptcha(): TextCaptcha |
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{ |
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if (is_null($this->captcha)) { |
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$this->generateQuestion(); |
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} |
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return $this->captcha; |
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} |
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private function generateQuestion() |
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{ |
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$questionParts = []; |
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$questionParts[] = rand(0, 9); |
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$questionParts[] = array_rand($this->arithemticalFunctions); |
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$questionParts[] = rand(0, 9); |
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$questionParts[] = array_rand($this->arithemticalFunctions); |
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$questionParts[] = rand(0, 9); |
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$this->captcha = new TextCaptcha( |
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$this->getQuestionString($questionParts), |
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$this->calculateAnswer($questionParts) |
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); |
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} |
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private function getQuestionString(array $questionParts):string |
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{ |
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$question = ''; |
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foreach ($questionParts as $key => $part) { |
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if ($key % 2 == 0) { |
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$question .= $this->translator->trans($this->numbers[$part]); |
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} else { |
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$question .= $this->translator->trans($this->arithemticalFunctions[$part]); |
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} |
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$question .= ' '; |
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} |
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/* |
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$question = ''; |
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$question .= $this->numbers[$questionParts[0]]; |
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$question .= ' ' . $this->arithemticalFunctions[$questionParts[1]] . ' '; |
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$question .= $this->numbers[$questionParts[2]]; |
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$question .= ' ' . $this->arithemticalFunctions[$questionParts[3]] . ' '; |
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$question .= $this->numbers[$questionParts[4]]; |
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*/ |
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return rtrim($question); |
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} |
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private function calculateAnswer(array $questionParts): string |
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{ |
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$result = array_shift($questionParts); |
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for ($i = 0; $i < count($questionParts); $i=$i+2) { |
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switch($questionParts[$i]) { |
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case '+': |
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$result = $result + $questionParts[$i+1]; |
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break; |
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case '-': |
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$result = $result - $questionParts[$i+1]; |
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break; |
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} |
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} |
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return $result; |
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} |
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} |
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didatus /
TextCaptcha
If the size of the collection does not change during the iteration, it is generally a good practice to compute it beforehand, and not on each iteration: