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  1. <?php
  2. error_reporting(-1);
  3. $input = "1+2**+-3/2*4-6=";
  4.  
  5. $tester = '#[\d\+\-*/=\s]#';
  6. for ($i=0; $i<mb_strlen($input); $i++) {
  7. 	if (!preg_match($tester, mb_substr($input, $i, 1))) {
  8. 		echo "Формат неверен";
  9. 		exit();
  10. 	} 
  11. }
  12.  
  13. echo "Вычисляем значение выражения: $input\n";
  14.  
  15. $devider = '#(\+|-|\*|=|/)#';
  16. $parts = preg_split($devider, $input,0, PREG_SPLIT_DELIM_CAPTURE);
  17. $length = count($parts);
  18. $result = $parts[0];
  19.  
  20. for($i=1; $i<$length; $i++) {
  21. 	if ($parts[$i] == "+") {
  22. 		echo "$result + {$parts[$i+1]} = ";
  23. 		$result += $parts[$i+1];
  24. 		echo "$result\n";
  25. 	} elseif ($parts[$i] == "-") {
  26. 		echo "$result - {$parts[$i+1]} = ";
  27. 		$result -= $parts[$i+1];
  28. 		echo "$result\n";
  29. 	} elseif ($parts[$i] == "*") {
  30. 		echo "$result * {$parts[$i+1]} = ";
  31. 		$result *= $parts[$i+1];
  32. 		echo "$result\n";
  33. 	} elseif ($parts[$i] == "/") {
  34. 		echo "$result / {$parts[$i+1]} = ";
  35. 		$result /= $parts[$i+1];
  36. 		echo "$result\n";
  37. 	}
  38. }
  39.  
  40. echo "Ответ равен: $result";
Success #stdin #stdout 0.01s 20520KB
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Standard input is empty
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Вычисляем значение выражения: 1+2**+-3/2*4-6=
1 + 2 = 3
3 *  = 0
0 *  = 0
0 +  = 0
0 - 3 = -3
-3 / 2 = -1.5
-1.5 * 4 = -6
-6 - 6 = -12
Ответ равен: -12
https://ideone.com/REK7a8
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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