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  1. <?php
  2.  
  3. $example = '4+10+3=';
  4. $number = 0;
  5. $char = 'none';
  6. $op = 'none';
  7. $result = 0;	
  8.  
  9. for ($i=0; ; $i++) { 
  10.  
  11. 	$getSingleOne = substr($example, $i, 1);
  12.  
  13. 	if (is_numeric($getSingleOne)) {
  14. 		$number = ($number * 10) + intval($getSingleOne);
  15. 	} else {
  16. 		$char = $getSingleOne;
  17.  
  18.         if (preg_match('/[+]/', $op) == TRUE || preg_match('/none/', $op)) {
  19. 		    $result += $number;
  20. 	    } elseif (preg_match('/-/', $op) == TRUE) {
  21. 		    $result -= $number;
  22. 	    } elseif (preg_match('/\//', $op) == TRUE) {
  23. 		    $result /= $number;
  24. 	    } elseif (preg_match('/[*]/', $op) == TRUE) {
  25. 	    	$result *= $number;
  26. 	    }elseif (preg_match('/=/', $char) == TRUE) {
  27.             break;
  28. 	    }
  29.  
  30. 		$number = 0;
  31. 		$op = $char;
  32. 	}
  33. }
  34.  
  35. echo "{$example} {$result}";
  36. ?>
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https://ideone.com/hJT7gG
language:
PHP (php 7.3.5)
created:
3 years ago
visibility:
public

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