Comparison Operators
Comparison operators, as their name implies, allow you to compare two values. You may also be interested in viewingthe type comparison tables, as they show examples of various type related comparisons.
Table 10-4. Comparison Operators
ExampleNameResult$a == $bEqual TRUE if $a is equal to $b.$a === $bIdentical TRUE if $a is equal to $b, and they are of the same type. (PHP 4 only) $a != $bNot equal TRUE if $a is not equal to $b.$a <> $bNot equal TRUE if $a is not equal to $b.$a !== $bNot identical TRUE if $a is not equal to $b, or they are not of the same type. (PHP 4 only) $a < $bLess than TRUE if $a is strictly less than $b.$a > $bGreater than TRUE if $a is strictly greater than $b.$a <= $bLess than or equal to TRUE if $a is less than or equal to $b.$a >= $bGreater 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.
<?php
// Example usage for: Ternary Operator
$action = (empty($_POST['action'])) ? 'default' : $_POST['action'];
// The above is identical to this if/else statement
if (empty($_POST['action'])) {
$action = 'default';
} else {
$action = $_POST['action'];
}
?>
See also strcasecmp(), strcmp(),Array operators, and the manual section onTypes.
