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  1. <?php
  2.  
  3. function calculate($expression) {
  4.     $numArr = preg_split('#(\\+|\\*|-|/|%)#', $expression, -1, PREG_SPLIT_DELIM_CAPTURE);
  5.  
  6.         for($i = 0; count($numArr) > 1; $i++) {
  7.             switch ($numArr[$i]) {
  8.                 case '/':
  9.                     $numArr[$i] = $numArr[$i - 1] / $numArr[$i + 1];
  10.                     unset($numArr[$i + 1]);
  11.                     unset($numArr[$i - 1]);
  12.                     $numArr = array_values($numArr);
  13.                     $i = 0;
  14.                     break;
  15.  
  16.                 case '*':
  17.                     $numArr[$i] = $numArr[$i - 1] * $numArr[$i + 1];
  18.                     unset($numArr[$i + 1]);
  19.                     unset($numArr[$i - 1]);
  20.                     $numArr = array_values($numArr);
  21.                     $i = 0;
  22.                     break;
  23.  
  24.                 case '%':
  25.                     $numArr[$i] = $numArr[$i - 1] % $numArr[$i + 1];
  26.                     unset($numArr[$i + 1]);
  27.                     unset($numArr[$i - 1]);
  28.                     $numArr = array_values($numArr);
  29.                     $i = 0;
  30.                     break;
  31.  
  32.                 default:
  33.                     break;
  34.             }    
  35.             if(!(preg_match('#(\\*|/|%)#', implode("", $numArr)))) break;    
  36.         }
  37.  
  38.         for($i = 0; count($numArr) > 1; $i++) {
  39.             switch ($numArr[$i]) {
  40.                 case '+':
  41.                     $numArr[$i] = $numArr[$i - 1] + $numArr[$i + 1];
  42.                     unset($numArr[$i + 1]);
  43.                     unset($numArr[$i - 1]);
  44.                     $numArr = array_values($numArr);
  45.                     $i = 0;
  46.                     break;
  47.  
  48.                 case '-':
  49.                     $numArr[$i] = $numArr[$i - 1] - $numArr[$i + 1];
  50.                     unset($numArr[$i + 1]);
  51.                     unset($numArr[$i - 1]);
  52.                     $numArr = array_values($numArr);
  53.                     $i = 0;
  54.                     break;
  55.  
  56.                 default:
  57.                     break;
  58.             }    
  59.  
  60.             if(count($numArr) == 1) {
  61.             $numArr = array_values($numArr);
  62.             break;
  63.         }
  64.     }
  65.     return $numArr[0];
  66. }
  67.  
  68. echo calculate("200+100/100-2011");
Success #stdin #stdout 0.02s 24788KB
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https://ideone.com/7pZX1Y
language:
PHP (php 7.3.5)
created:
3 years ago
visibility:
public

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