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  1. <?php
  2.  
  3. error_reporting(-1);
  4.  
  5.  
  6. $input = '243+6743-78*2=';
  7. $inputLength = mb_strlen($input);
  8.  
  9. $number = 0;
  10. $result = 0;
  11. $op = '';
  12.  
  13. for ($i = 0; $i < $inputLength; $i++) {
  14.  
  15. 	$char = mb_substr($input, $i, 1);
  16. 	if ($char == '*' || $char == '+' || $char == '-' || $char == '=') {
  17. 	     echo "op=[$op], result = [$result], number = [$number], char = [$char]\n";
  18. 		intval($number);
  19. 		if ($op == '') {
  20. 			$result = $number;
  21. 			$number = 0;
  22. 			$op = $char;
  23. 		}
  24. 		if ($op == '+') {
  25. 			$result += $number;
  26. 			$number = 0;
  27. 			$op = $char;
  28. 		}
  29. 		if ($op == '-') {
  30. 			$result -= $number;
  31. 			$number = 0;
  32. 			$op = $char;
  33. 		}
  34. 		if ($op == '*') {
  35. 			$result *= $number;
  36. 			$number = 0;
  37. 			$op = $char;
  38. 		}
  39. 		if ($char == '=') {
  40. 			echo $input . $result;
  41. 		}
  42.  
  43. 	} elseif (is_numeric($char)) {
  44.         $number = $number * 10 + $char;
  45. 	}else {
  46. 		echo 'Неверный символ: {$char}\n';
  47. 	}
  48. }
Runtime error #stdin #stdout #stderr 0.02s 82560KB
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Standard input is empty
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Standard output is empty
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PHP Fatal error:  Uncaught Error: Call to undefined function mb_strlen() in /home/H14mmy/prog.php:7
Stack trace:
#0 {main}
  thrown in /home/H14mmy/prog.php on line 7
https://ideone.com/Hd0ids
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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