Comparison operators, as their name implies, allow you to compare two values.
Table 10-3. Comparison Operators
| Example | Name | Result |
|---|---|---|
| $a == $b | Equal | True if $a is equal to $b. |
| $a === $b | Identical | True if $a is equal to $b, and they are of the same type. (PHP 4 only) |
| $a != $b | Not equal | True if $a is not equal to $b. |
| $a !== $b | Not identical | True if $a is not equal to $b, or they are not of the same type. (PHP 4 only) |
| $a < $b | Less than | True if $a is strictly less than $b. |
| $a > $b | Greater than | True if $a is strictly greater than $b. |
| $a <= $b | Less than or equal to | True if $a is less than or equal to $b. |
| $a >= $b | Greater than or equal to | True if $a is greater than or equal to $b. |
Another conditional operator is the "?:" (or ternary) operator, which operates as in C and many other languages.
This expression evaluates to expr2 if expr1 evaluates to true, and expr3 if expr1 evaluates to false.