Advanced PHP for Web Professionals

Operators

PHP support for operators includes the following:

Arithmetic Operators

PHP supports the standard mathematical operators:

$a = 4; 
$b = 2;
//Addition: $a + b = 6
//Subtraction: $a - $b = 2
//Multiplication: $a * $b = 8
//Division :$a / $b = 2
//Modulus (remainder of $a / $b): $a % $b = 0
//Increment: $a++ (would equal 5 since $a = 4)

Assignment Operators

The two main assignment operators in php are “=” and “.”. The equals sign should be obvious; it assigns a value to a variable:

$a = 4; 
$b = $a;
// $b = 4

Comparison Operators

PHP supports the standard comparison operators, as shown in Table 1-1:

Table 1-1. Comparison Operators in PHP

OPERATOR	DESCRIPTION
$a == $b	test if two values are equal
$a != $b	test if two values are not equal ...