Example: 1

	<?php

	function calc($num1, $num2, $op)
	{
	switch ($op)
	{
	case "+";
	$total = $num1 + $num2;
	break;
	
	case "-";
	$total = $num1 - $num2;
	break;
	
	case "*";
	$total = $num1 * $num2;
	break;
	 
	 
	case "/";
	$total = $num1 / $num2;
	break;
	
	default:
	echo "Unknown operator.";
	
	}	
	} 

	?>


Example: 2

	<?php

	function calc($num1, $num2, $op)
	{
	switch ($op)
	{
	case "+";
	$total = $num1 + $num2;
	break;
	
	case "-";
	$total = $num1 - $num2;
	break;
	
	case "*";
	$total = $num1 * $num2;
	break;
	 
	 
	case "/";
	$total = $num1 / $num2;
	break;
	
	default:
	echo "Unknown operator.";
	
	}	
	
	calc(10,10,"+");

	} 

	?>


Example: 3

	<?php

	function calc($num1, $num2, $op)
	{
	switch ($op)
	{
	case "+";
	$total = $num1 + $num2;
	break;
	
	case "-";
	$total = $num1 - $num2;
	break;
	
	case "*";
	$total = $num1 * $num2;
	break;
	 
	 
	case "/";
	$total = $num1 / $num2;
	break;
	
	default:
	echo "Unknown operator.";
	
	}	
	
	echo calc(10,10,"+");

	} 

	?>

Example: 4

	<?php

	function calc($num1, $num2, $op)
	{
	switch ($op)
	{
	case "+";
	$total = $num1 + $num2;
	return $total;
	break;
	
	case "-";
	$total = $num1 - $num2;
	return $total;
	break;
	
	case "*";
	$total = $num1 * $num2;
	return $total;
	break;
	 
	 
	case "/";
	$total = $num1 / $num2;
	return $total;
	break;
	
	default:
	echo "Unknown operator.";
	
	}	
	
	echo calc(10,10,"+");

	} 

	?>

Example: 5

	<?php

	function calc($num1, $num2, $op)
	{
	switch ($op)
	{
	case "+";
	$total = $num1 + $num2;
	return $total;
	break;
	
	case "-";
	$total = $num1 - $num2;
	return $total;
	break;
	
	case "*";
	$total = $num1 * $num2;
	return $total;
	break;
	 
	 
	case "/";
	$total = $num1 / $num2;
	return $total;
	break;
	
	default:
	echo "Unknown operator.";
	
	}	
	
	
	} 
	echo calc(10,10,"+");

	?>


Example: 6

	<?php

	function calc($num1, $num2, $op)
	{
	switch ($op)
	{
	case "+";
	$total = $num1 + $num2;
	return $total;
	break;
	
	case "-";
	$total = $num1 - $num2;
	return $total;
	break;
	
	case "*";
	$total = $num1 * $num2;
	return $total;
	break;
	 
	 
	case "/";
	$total = $num1 / $num2;
	return $total;
	break;
	
	default:
	echo "Unknown operator.";
	
	}	
	
	
	} 
	echo calc(13,7,"/");

	?>


Example:7

	<?php

	function calc($num1, $num2, $op)
	{
	switch ($op)
	{
	case "+";
	$total = $num1 + $num2;
	return $total;
	break;
	
	case "-";
	$total = $num1 - $num2;
	return $total;
	break;
	
	case "*";
	$total = $num1 * $num2;
	return $total;
	break;
	 
	 
	case "/";
	$total = $num1 / $num2;
	return $total;
	break;
	
	default:
	echo "Unknown operator.";
	
	}	
		
	} 
	echo calc(13,7,"a");

	?>
