Comparison operators, as their name implies, allow you to compare
two values. You may also be interested in viewing
the type comparison tables,
as they show examples of various type related comparisons.
Table 14-4. 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. (introduced in PHP 4)
|
| $a != $b | Not equal | TRUE if $a is not equal to $b. |
| $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. (introduced in PHP 4)
|
| $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. |
If you compare an integer with a string, the string is
converted to a number.
If you compare two numerical strings, they are compared as integers. These
rules also apply to the
switch statement.
Another conditional operator is the "?:" (or ternary) operator.
The expression
(expr1) ? (expr2) : (expr3)
evaluates to
expr2 if
expr1 evaluates to
TRUE, and
expr3 if
expr1 evaluates to
FALSE.
See also strcasecmp(),
strcmp(),
Array operators,
and the manual section on
Types.
