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Chapter 11. Control Structures |
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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:
if ($a > $b) {
print "a is bigger than b";
} elseif ($a == $b) {
print "a is equal to b";
} else {
print "a is smaller than b";
}
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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.
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