This is my first php program!

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Bog'liq
PHP


With the ternary conditional operator, it looks like this:
'.($active ? 'yes':'no').'' ?>
Compare the syntax of the two:
if (
expression
)
true_statement
else
false_statement
(
expression
) ?
true_expression
:
false_expression
The main difference here is that the conditional operator is not a statement at all.
This means that it is used on expressions, and the result of a complete ternary
expression is itself an expression. In the previous example, the
echo
statement is
inside the
if
condition, while when used with the ternary operator, it precedes the
expression.
switch
It often is the case that the value of a single variable may determine one of a num-
ber of different choices (e.g., the variable holds the username and you want to do
something different for each user). The
switch
statement is designed for just this
situation.
,ch02.15294 Page 48 Wednesday, March 13, 2002 11:42 AM

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48 | Chapter 2: Language Basics Last Name: Lee Please log in. Because if is a statement, you can chain them: if ($good) print('Dandy!'); else if ($error) print('Oh, no!'); else print("I'm ambivalent..."); Such chains of if statements are common enough that PHP provides an easier syn- tax: the elseif statement. For example, the previous code can be rewritten as: if ($good) print('Dandy!'); elseif ($error) print('Oh, no!'); else print("I'm ambivalent..."); The ternary conditional operator ( ?: ) can be used to shorten simple true/false tests. Take a common situation such as checking to see if a given variable is true and print- ing something if it is. With a normal if / else statement, it looks like this:

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