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  1. <?php
  2.  
  3. error_reporting(-1);
  4. mb_internal_encoding('utf-8');
  5.  
  6. $input = "-7/4*15+8-5=";
  7.  
  8. $res     = 0;
  9. $op      = "";
  10. $numbers = preg_split("/(\\s*[\\*\\-\\+\\/\\=]\\s*)/", $input, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
  11. //print_r($numbers);
  12.  
  13. foreach ($numbers as $key => $val) {
  14.  
  15.     $numbers[$key] = trim($val);
  16.  
  17.     if (preg_match("/[\\+\\-\\/\\*]/", $val)) {
  18.         $op = $val;
  19.         continue;
  20.     } elseif (is_numeric($val)) {
  21.         switch ($op) {
  22.             case "+":
  23.             case "":
  24.                 $res += $val;
  25.                 break;
  26.             case "-":
  27.                 $res -= $val;
  28.                 break;
  29.             case "*":
  30.                 $res *= $val;
  31.                 break;
  32.             case "/":
  33.                 $res /= $val;
  34.                 break;
  35.             default:
  36.                 echo "Wrong input!";
  37.         }
  38.         continue;
  39.     } elseif ($val == "=") {
  40.         $res = round($res, 2);
  41.         echo "$res \n";
  42.         exit;
  43.     } else
  44.         echo "Wrong input!";
  45.     exit;
  46. }
  47. ?>
  48.  
Success #stdin #stdout 0.01s 20568KB
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-23.25
https://ideone.com/T4r0x5
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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