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content/05-comparisons.md

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+A boolean is a value that is always 0 or 1, yes or no, on or off.
+In PHP, a boolean is represented by the words true and false.
+While programming, you will often want to know if something is positive or negative.
+```php
+<?php
+
+$a = true;
+$b = false;
+```
+
+There are many constructs and functions that will return a boolean.
+To start, let's look at comparisons.
+
+Double equals checks if two values are equal.
+```php
+$one = 1;
+$two = 2;
+
+$one == $two; // returns false
+```
+
+An exclamation point and equal sign check if two values are not equal.
+```php
+$one != $two; // returns true
+```
+
+You can use greater than and less than symbols to check for comparisons too.
+```php
+$one > $two; // returns false
+$one < $two; // returns true
+```
+
+If you combine a greater than or less than symbol with an equal,
+it will check if the value is greater or less than or equal to another value.
+```php
+$one <= $two;
+$one >= $two;
+```
+You can also check that two values are equal and of the same type
+by using three equal signs.
+
+The following comparisons return true.
+```php
+1 == 1;
+1 == '1';
+1 == true;
+1 == 1.0;
+1 === 1;
+```
+
+These return false.
+```php
+1 === '1';
+1 === true;
+1 === 1.0;
+```