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PHP 运算符
tryphp_oper_ternary
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<!DOCTYPE html> <html> <body> <?php // if empty($user) = TRUE, set $status = "anonymous" echo $status = (empty($user)) ? "anonymous" : "logged in"; echo("<br>"); $user = "John Doe"; // if empty($user) = FALSE, set $status = "logged in" echo $status = (empty($user)) ? "anonymous" : "logged in"; ?> </body> </html>
anonymous
logged in