Why am I getting the error parse error: syntax error, unexpected '{' on line 18?

// Not sure as this works ok, as i just tested and passed with my code below.(i dont see a diff in your code). Try refreshing the page or submitting a few times etc.

 <?php
        class Shape {
          public $hasSides = true;
        }
        
        class Square extends Shape {
        
        }
        
        $square = new Square();
        // Add your code below!
        if (property_exists($square, "hasSides")) {
          echo "I have sides!";
        }
      ?>

In line 18 you didnt closed the bracket of property_exists. Try that…You will get the correct answer..!!

Not sure if this helps, being so late and all but I noticed your missing a ) in your if statement

you have if (property_exists($square, “hasSides”)

not if (property_exists($square, “hasSides))

This worked for me just now; Using Waterfox 35.0

  <?php
    class Shape {
      public $hasSides = true;
    }
    
    class Square extends Shape {
    
    }
    
    $square = new Square();
    // Add your code below!
    if (property_exists($square,'hasSides')) {
      echo "I have sides!";
    }
  ?>

the answer was really simple he missed to close the bracket.. why try this and this worked for me..lol