PHP Boolean Variables

Submitted by Yorkiebar on Tuesday, December 31, 2013 - 07:09.

Introduction: This tutorial will cover boolean variables in PHP. What is a variable? A variable is a piece of information which holds a value. Each variable has a type and a reference name. The value of a variable will depend on the type for that particular variable. What types can a variable be? There are a few different basic types of variable which include; Strings Booleans Integers Strings hold characters, letters, numbers and symbols in a string format (essentially a character array), Booleans hold a true or false value and Integers hold a full number. When are booleans used? Booleans are used to determine if something is true or false and as such it can only hold a 'true' or 'false' value. Booleans are used in statements such as the if and else. Bool is the shorthand version of Boolean. Examples: Creating a boolean variable named 'bool':

$bool;

Creating and initializing a boolean variable named 'bool':

$bool = true;

Checking if bool is true, and if it is outputting 'Yes':

$bool = true;
if ($bool) {
	echo 'Yes';
}

Checking if bool is true, and if it is outputting 'Yes'; the below code would NOT output:

$bool = false;
if ($bool) {
	echo 'Yes';
}

Even though our boolean is not a string, we can still output the value. However; if it is true, it will be a string value of '1'; and a '0' if it is false:

$bool = true;
echo $bool;

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