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Comparison Operators

Comparison Operators

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

Table 10-3. Comparison Operators

ExampleNameResult
$a == $bEqualTRUE 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 equalTRUE if $a is not equal to $b.
$a <> $bNot equalTRUE 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 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 ternary) 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.