Comparison Operators

Comparison operators, as their name implies, allow you to compare two values.

Table 10-3. Comparison Operators

$a == $bEqualTrue if $a is equal to $b.
$a === $bIdenticalTrue if $a is equal to $b, and they are of the same type. (PHP4 only)
$a != $bNot equalTrue if $a is not equal to $b.
$a < $bLess thanTrue if $a is strictly less than $b.
$a > $bGreater thanTrue 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 trinary) operator, which operates as in C and many other languages.

(expr1) ? (expr2) : (expr3);

This expression evaluates to expr2 if expr1 evaluates to true, and expr3 if expr1 evaluates to false.