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  1. <?php
  2. $input = '5+6*2+1=';
  3. $inputLenght = mb_strlen($input);
  4.  
  5. $number = 0;
  6. $result = 0;
  7. $op = ' ';
  8.  
  9. for($i = 0; $i < $inputLenght; $i++){
  10. 	$char = mb_substr($input, $i, 1);
  11. 	if($char == '*' || $char == '+' || $char == '-' || $char == '=') {
  12.  
  13.     switch($op){
  14.     	case '+':
  15.     		$result = intval("$result") + intval("$number");
  16.     	case '*':
  17.     		$result = intval("$result") * intval("$number");
  18.     	case '-':
  19.     		$result = intval("$result") - intval("$number");
  20.     	case '=':
  21.     		$result = intval("$result") + intval("$number");
  22.  
  23.  
  24.  
  25.     }
  26.     echo "op = [$op] , result = [$result], number = [$number], char = [$char] \n";
  27.     $number = 0;
  28. 	$op = $char;
  29.  
  30.  
  31.  
  32. 	}elseif (is_numeric($char)) {
  33.  
  34. 	    $number = ($number * 10) + $char; 
  35.  
  36.  
  37. 	}else {
  38. 	    echo " WRONG SYMBOL: {$char} \n";	
  39. 	}
  40. }
  41.  
  42.  
  43.     echo " Ответ: $input $result";
Success #stdin #stdout 0.02s 52472KB
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Standard input is empty
stdout
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op = [ ] , result = [0], number = [5], char = [+] 
op = [+] , result = [36], number = [6], char = [*] 
op = [*] , result = [72], number = [2], char = [+] 
op = [+] , result = [73], number = [1], char = [=] 
 Ответ: 5+6*2+1= 73
https://ideone.com/mXyAKw
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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