For this tutorial you will need some files found at http://www.tutvid.com/downloads.html. You will learn to build an email handling PHP script that sends info from your on line form to your e-mail. For this you will need any version of Dreamweaver.

This is a very interesting tutorial if you would like to build your own calculator written in PHP. It guides you through all the steps and it is very clean written and has a good error checking. It uses if, witch and other math functions.

And … from users recommendation I have inserted the php code used in the video:

<?php

if ( !$_POST['submit'] ) {
	echo "<table border=\"0\" cellspacing=\"3\" cellpadding=\"3\">\n";
	echo "<form method=\"post\" action=\"calc.php\">\n";
	echo "<tr><td><input type=\"text\" name=\"num1\"/></td>\n";
	echo "<td><select name=\"sign\"><option value=\"plus\">+</option>\n<option value=\"minus\">-</option>\n<option value=\"multi\">*</option>\n<option value=\"divide\">/</option></select></td>\n";
	echo "<td><input type=\"text\" name=\"num2\"/></td>\n";
	echo "<td><input type=\"submit\" name=\"submit\" value=\"Calculate\"/></td></tr>\n";
	echo "</form></table>\n"; 
} else {
	$num1 = $_POST['num1'];
	$num2 = $_POST['num2'];
	$sign = $_POST['sign'];
	
	$errors = array();
	
	$signs = array('plus', 'minus', 'multi', 'divide');
	
	if (!$num1) {
		$errors[] = "You did not supplied the first number";
	} else {
		if (!$num2) {
			$errors[] = "You did not supplied the second number";
		} else {
			if(!$sign) {
				$errors[] = "You did not supplied a sign to calculate your two numbers";				
			} else {
				if (!in_array($sign, $signs)) {
					$errors[] = "Invalid sign for calculation";
				} else {
					if($sign == "divide") {
						if ($num2 == 0) {
							$errors[] = "You cannot divide by 0. Please choose a different number to divide with";
						}
					}
					
					if (!is_numeric($num1)) {
						$errors[] = "Your first number is not numeric";
					} else {
						if (!is_numeric($num2)) {
							$errors[] = "Your second number is not numeric";
						}
					}					
				}
			}
		}
	}
	if (count($errors)>0) {
		echo "The fallowing errors occurred:<br>\n";
		foreach ($errors as $error) {
			echo $error."<br>\n";
		}
	} else {
		switch ($sign) {
			case 'plus':
				$equation = $num1 + $num2;
				$written = $num1 . " + " . $num2;
			break;
			
			case 'minus':
				$equation = $num1 - $num2;
				$written = $num1 . " - " . $num2;
			break;
			
			case 'multi':
				$equation = $num1 * $num2;
				$written = $num1 . " * " . $num2;
			break;
			
			case 'divide':
				$equation = $num1 / $num2;
				$written = $num1 . " / " . $num2;
			break;
			
			default :
				$equation = "";
				$written = "";
			break;
		}
		
		echo $written . " = " . $equation; 
	}
}
</pre>


    

With this movie you will be shown how to send email by making submitting a form.

In this video tutorial you will learn how to create basic HTML web pages and how to create tables and process forms.