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  1. <?php
  2. mb_internal_encoding('utf-8');
  3. function calculate($string) {
  4.     $input = $string;
  5.     $action = '';
  6.     $result = 0;
  7.     $currNumber = '';
  8.  
  9.     for ($i = 0; $i < mb_strlen($input); $i++) {
  10.         $char = mb_substr($input, $i, 1);
  11.         if (is_numeric($char)) $currNumber .= $char;
  12.         else {
  13.             if ($action == '') $result = intval($currNumber);
  14.             else {
  15.                 switch ($action) {
  16.                     case '+':
  17.                         $result += intval($currNumber);
  18.                         break;
  19.                     case '-':
  20.                         $result -= intval($currNumber);
  21.                         break;
  22.                     case '*':
  23.                         $result *= $currNumber;
  24.                         break;
  25.                     case '/':
  26.                         $result /= $currNumber;
  27.                         break;
  28.                 }
  29.             }
  30.             $action = $char;
  31.             $currNumber = '';
  32.             if ($action == '=') {
  33.                 echo nl2br("done: \n {$input}{$result}");
  34.                 exit();
  35.             }
  36.         }
  37.         // TEST echo nl2br("current number $currNumber | result $result | action $action \n\n");
  38.     }
  39. }
  40. calculate('100+12157097-214907/12505*21469-10=');
Success #stdin #stdout 0.01s 52488KB
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Standard input is empty
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done: <br />
 100+12157097-214907/12505*21469-10=20502910.752499
https://ideone.com/q71hdO
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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