Calculations

Name	Operator	Examples	Result
Addition	+	1 + 3	4
		2 + 4	6
		3.5 + 2.4	5.9
Concatenation	.	'Awe' . 'some'	Awesome
		'3' . '5'	35
		10 . ' cats'	10 cats
Subtraction	-	5 - 3	2
		2 - 2	0
		3 - 5	-2
Multiplication	*	2 * 2	4
		3 * 5	15
		3 * 0	0
Division	/	10 / 2	5
		0 / 3	0
		5 / 0	INF
Remainder Of Division	%	10 % 2	0
		4 % 3	1
		17 % 6	5

Explanation for Remainder Of Division

Let's start with a program that prints rectangle's area by knowing it's width and height.

<?php $width = 2; $height = 3; // Calc Area: $area = $width * $height; echo "Area = " . $area;

Output:

Area = 6

Explanation

• At line 6 width and height are multiplied (via * operator).
• At line 7 string and number are concatenated via . operator.

Let's demonstrate the rest of the operators:

<?php $a = 5; $b = 2; echo "A = " . $a; echo "<br>"; // Prints new line. echo "B = " . $b; echo "<br>"; echo "A + B = " . ($a + $b); echo "<br>"; echo "A - B = " . ($a - $b); echo "<br>"; echo "A * B = " . ($a * $b); echo "<br>"; echo "Remainder of Division:" . ($a % $b); echo "<br>"; echo "Concating strings: "; echo "<br>"; $str1 = "Web "; $str2 = "Technologies"; echo $str1 . $str2; echo "<br>"; $numericStr1 = "1"; $numericStr2 = "2"; echo "1 + 2 = " . $numericStr1 . $numericStr2;

Output:

A = 5 B = 2 A + B = 7 A - B = 3 A * B = 10 Remainder of Division:1 Concat strings: Web Technologies 1 + 2 = 12