How to defind and set data to a string in a simple object in PHP

Question

Answer 1

class Obj
{
     public $s = '';
     
     function set_s($new_s = NULL)
     {
        $this->s = $new_s;
     
        return $this->s;
     }
}
 
$bim = new Obj;
$bim->set_s('BimBamBom');
echo $bim->s . "<br \>\n"; // BimBamBom

$bim->set_s();
echo $bim->s . "<br \>\n"; // NULL

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