PHP. Руководство по PHP. 2005

elseif

Руководство по PHP

Глава 16. Control Structures

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

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.