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  1. <?php 
  2. 	error_reporting(-1);
  3. 	mb_internal_encoding('utf-8');
  4.  
  5. 	function calculate($expression) {
  6. 		$chars = preg_split('//u', $expression);
  7. 		$operators = array('+', '-', '*', '=', '/');
  8. 		$result = 0;
  9. 		$lastOperator = '+';
  10. 		$input = '';
  11. 		foreach ($chars as $char) {
  12. 			if (is_numeric($char) or (($char == '.') && (mb_substr_count($input, '.') == 0))) {
  13. 				$input .= $char;
  14. 			} elseif  (in_array($char, $operators)){
  15. 				switch ($lastOperator) {
  16. 					case '+':
  17. 						$result += floatval($input);
  18. 						break;
  19. 					case '-':
  20. 						$result -= floatval($input);
  21. 						break;
  22. 					case '*':
  23. 						$result *= floatval($input);
  24. 						break;
  25. 					case '/':
  26. 						$result /= floatval($input);
  27. 						break;
  28. 				}
  29. 				if ($char == '=') {
  30. 					return $result;
  31. 				}
  32. 				$input = '';
  33. 				$lastOperator = $char;
  34. 			}
  35. 		}
  36. 	}
  37.  
  38. 	echo calculate('25.5 + 35.24.25 =');
  39. ?>
Success #stdin #stdout 0.01s 20568KB
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https://ideone.com/HFfDLb
Я у мамы калькулятор
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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