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  1. <?php
  2. $input = '-200 + 1=';
  3. echo "Было: $input...\n";
  4. preg_match_all('/([0-9]+)|(\+|\-|\*|\/|\=)/', $input, $array);
  5. $sum = $array[0][0];
  6. foreach ($array[0] as $key => $value)
  7.   {
  8.     if ($array[0][$key + 1] == '=')
  9.       {
  10.         echo "Стало: $sum";
  11.         break;
  12.       }
  13.     else
  14.       {
  15.         $operand2  = $array[0][$key + 2];
  16.         $operation = $array[0][$key + 1];
  17.         switch ($operation)
  18.         {
  19.             case "+":
  20.                 $sum += $operand2;
  21.                 break;
  22.             case "-":
  23.                 $sum -= $operand2;
  24.                 break;
  25.             case "*":
  26.                 $sum *= $operand2;
  27.                 break;
  28.             case "/":
  29.                 $sum /= $operand2;
  30.                 break;
  31.         }
  32.       }
  33.   }
Success #stdin #stdout 0.02s 20568KB
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Standard input is empty
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Было: -200 + 1=...
Стало: 1
https://ideone.com/LkHCCW
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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