PHP Operators - Page 2

Comparison Operators
These six PHP operators are used to compare the values of two variables. For example, I might test if one value is equal to another value. The result (or answer) of the comparison is either true or false.

==	equal to This is used to test if one value is equal to another. Notice that there are two equal signs. is $a == $b
!=	not equal to This is used to test if one value is not equal to another. is $a != $b
>	greater than This is used to test if one value is greater than another. is $a > $b
<	less than This is used to test if one value is less than another. is $a < $b
>=	greater than or equal to This is used to test if one value is greater than or equal to another. is $a >= $b
<=	less than or equal to This is used to test if one value is less than or equal to another. is $a <= $b

Logical Operators
There are three logical operators used for complicated comparisons. By complicated I mean more then one comparison. For example I might ask "is the sky blue and is the grass green". The result of the entire question is either true or false.

\|\|	or This is used to test if at least one comparison is true. You can use any number of comparisons. The result will be true if at least one of the comparisons is true. For example is the sky blue or is the grass green or is the water cold. is (($sky == "blue") \|\| ($grass == "green") \|\| ($water == "cold"))
&&	and This is used to test if all comparisons are true. You can use any number of comparisons. The result will be true if all of the comparisons are true. For example is the sky blue and is the grass green and is the water cold. is (($sky == "blue") && ($grass == "green") && ($water == "cold"))
!	not This is used to test if something is not true. is !$a

Note--The arrow

indicates that the code is wrapped to a second line and should really be all on one line.

Increment / Decrement Operators
These four operators are used to increase or decrease a value of a variable by a step (increment). An example would be a webpage counter. Each time someone views a webpage the counter will increment by 1 step.

++$a	Pre-increment Increase by one and then grab the value of $a
$a++	Post-increment Grab the value of $a and increase by 1
--$a	Pre-decrement Decrease by one and then grab the value of $a
$a--	Post-drecrement Grab the value of $a and then decrease by 1

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PHP Operators - Page 2

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