$a = $this->a; $b = $this->b; $num = $a - $b; echo "{$a}-{$b}={$num}</br>"; } function multiply() { $a = $this->a; $b = $this->b; $num = $a * $b; echo "{$a}*{$b}={$num}</br>"; } function divide() { $a = $this->a; $b = $this->b; $num = $a / $b; echo "{$a}/{$b}={$num}</br>"; } function __construct($a, $b) { $this->a = $a; $this->b = $b; } } $cal = new cal(5, 2); $cal->add(); $cal->minus(); $cal->multiply(); $cal->divide();