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  1. <?php
  2.  
  3. error_reporting(-1);
  4.  
  5. $input = '2-2*4+15-0/1.5=';
  6.  
  7. $number = 0;
  8. $result = 0;
  9. $op = '';
  10.  
  11. $numbersAndOperations = array();
  12. preg_match_all('/\d+\.?\d*|[+\-*\/=]/', $input, $numbersAndOperations);
  13.  
  14. foreach ($numbersAndOperations[0] as $chars) {
  15.  
  16. 	if ($chars == '-' or $chars == '+' or $chars == '*' or $chars == '/' or $chars == '=') {
  17.  
  18. 		$op = $chars;
  19.  
  20. 		if (!$result) {
  21. 			$result = $number;
  22. 		}
  23.  
  24. 	} else {
  25.  
  26. 		$number = floatval($chars);
  27.  
  28. 		if ($op) {
  29.  
  30. 			switch ($op) {
  31. 				case '-':
  32. 					$result -= $number;
  33. 					break;
  34. 				case '+':
  35. 					$result += $number;
  36. 					break;
  37. 				case '*':
  38. 					$result *= $number;
  39. 					break;
  40. 				case '/':
  41. 					$result /= $number;
  42. 					break;
  43. 			}
  44.  
  45. 			$number = 0;
  46. 		}
  47.  
  48. 	}
  49.  
  50. 	if ($op == '=') {
  51. 		echo round($result, 2);
  52. 		exit();
  53. 	}
  54.  
  55. }
Success #stdin #stdout 0.02s 24040KB
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https://ideone.com/MZjuzH
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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