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  1. <?php
  2.  
  3. error_reporting(-1);
  4. mb_internal_encoding('utf-8');
  5.  
  6.  
  7. $strInput = "34-66+32=";
  8. $length = strlen($strInput);
  9. $number = 0; 
  10. $result = 0; 
  11. $op = ''; 
  12.  
  13. function action($op, $int1, $int2) {
  14.     $result = 0;
  15.     if ($op == "+") {
  16.         $result = $int1 + $int2;
  17.     } elseif ($op == "-") {
  18.         $result = $int1 - $int2;
  19.     } elseif ($op == "*") {
  20.         $result = $int1 * $int2;
  21.     }
  22.     return $result;
  23. }
  24.  
  25.  
  26. for ($i = 0; $i < $length; $i++) {
  27.     $char = mb_substr($strInput, $i, 1);
  28.     if (is_numeric($char) && $op == '') {
  29.  
  30.         $result = (($result * 10) + intval($char));
  31.  
  32.     }
  33.  
  34.         elseif (is_numeric($char)) {
  35.             $number = (($number * 10) + intval($char));
  36.             var_dump($number);
  37.  
  38.     }
  39.  
  40.         elseif ($char == '*' || $char == '+' || $char == '-') {
  41.             if ($op == '') {
  42.                 $op = $char;
  43.             } else {
  44.                 $result = action($char, $result, $number);
  45.                 echo "result is {$result}";
  46.                 $op = $char;
  47.                 $number = 0;
  48.             }
  49.     } 
  50.  
  51.         elseif ($char == '=') {
  52.             $result = action($op, $result, $number);
  53.             echo $result;
  54.             exit();
  55.  
  56.     }
  57.  
  58.         else {
  59.             echo "Wrong symbol: {$char} \n";
  60.  
  61.     }
  62. }
Success #stdin #stdout 0.01s 52488KB
comments (?)
stdin 
Standard input is empty
stdout 
int(6)
int(66)
result is 100int(3)
int(32)
132
https://ideone.com/Iz40zU
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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