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

$a < $b

test if the first value is less than the second

$a > $b

test if the first value is greater than the second

$a <= $b

test if the first value is less than or equal to the second

$a >= $b

test if the first value is greater than or equal to the second

PHP also supports the standard increment and decrement operators:

 $a = 5;  $a++; // $a = 6 $b = 5; $b--; //$b = 4 

Concatenating Strings

The "." operator concatenates two values:

 $sentence_a = "The quick brown ";  $sentence_b = "fox jumped..."; $sentence_c = $a . $b; //$sentence_c = "The quick brown fox jumped..."; 

   
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Advanced PHP for Web Professionals
Advanced PHP for Web Professionals
ISBN: 0130085391
EAN: 2147483647
Year: 2005
Pages: 92

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