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  1. <?php
  2.  
  3. error_reporting(-1);
  4. mb_internal_encoding('utf-8');
  5.  
  6. $input = '1=';
  7.  
  8. $regexp = '/((\\/|\\*|\\+|\\-)(\\/|\\*|\\+))|(^(\\/|\\*|\\+))/';
  9. if (preg_match($regexp, $input)) {
  10. 	echo "Выражение введено с ошибкой";
  11. 	exit;
  12. }
  13.  
  14. $regexp = '/(?<=\\d)(\\+|\\*|\\/|\\-)(?=(\\-)?\\d(\\.)?)/';
  15. $numbersAndSteps[0] = preg_split($regexp, $input, 0, PREG_SPLIT_NO_EMPTY);
  16. foreach($numbeAndSteps[0] as $number) {
  17. 	$number = floatval($number);
  18. }
  19.  
  20. $regexp = '/((?<=\\+|\\*|\\/|\\-)\\-?\\d+\\.?\\d*)|(^\\-\\d+\\.?\\d*)/';
  21. $numbersAndSteps[1] = preg_split($regexp, $input, 0, PREG_SPLIT_NO_EMPTY);
  22.  
  23. $amountOfNumbers = count($numbersAndSteps[0]);
  24.  
  25. $sum = $numbersAndSteps[0][0];
  26. for ($i = 0; $i < $amountOfNumbers ; $i++) {
  27.  
  28. 	$followingNumber = $numbersAndSteps[0][$i+1];
  29.  
  30.     if($numbersAndSteps[1][$i] == '+'){		
  31. 		$sum = $sum + $followingNumber;
  32. 	} elseif ($numbersAndSteps[1][$i] == '-'){		
  33. 		$sum = $sum - $followingNumber;
  34. 	} elseif($numbersAndSteps[1][$i] == '*'){
  35. 		$sum = $sum * $followingNumber;
  36. 	} elseif ($numbersAndSteps[1][$i] == '/'){		
  37. 		$sum = $sum / $followingNumber;
  38. 	}
  39. }
  40.  
  41. echo "Ответ: {$sum}";
Success #stdin #stdout #stderr 0.02s 52432KB
comments (?)
stdin
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Standard input is empty
stdout
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Ответ: 1=
stderr
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PHP Notice:  Undefined variable: numbeAndSteps in /home/tvZgLb/prog.php on line 16
PHP Warning:  Invalid argument supplied for foreach() in /home/tvZgLb/prog.php on line 16
PHP Notice:  Undefined offset: 1 in /home/tvZgLb/prog.php on line 28
https://ideone.com/AcQSgh
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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