else
Alternative syntax for control structures
Control Structures
PHP Manual

## elseif

elseif, as its name suggests, is a combination of if and else. Like else, it extends an if statement to execute a different statement in case the original if expression evaluates to `FALSE`. However, unlike else, it will execute that alternative expression only if the elseif conditional expression evaluates to `TRUE`. For example, the following code would display a is bigger than b, a equal to b or a is smaller than b:

`<?php
if ($a > $b) {
echo "a is bigger than b";
} elseif ($a == $b) {
echo "a is equal to b";
} else {
echo "a is smaller than b";
}
?>`

There may be several elseifs within the same if statement. The first elseif expression (if any) that evaluates to `TRUE` would be executed. In PHP, you can also write 'else if' (in two words) and the behavior would be identical to the one of 'elseif' (in a single word). The syntactic meaning is slightly different (if you're familiar with C, this is the same behavior) but the bottom line is that both would result in exactly the same behavior.

The elseif statement is only executed if the preceding if expression and any preceding elseif expressions evaluated to `FALSE`, and the current elseif expression evaluated to `TRUE`.

else
Alternative syntax for control structures
Control Structures
PHP Manual