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PHP 运算符
tryphp_oper_null_coalescing
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<!DOCTYPE html> <html> <body> <?php // variable $user is the value of $_GET['user'] // and 'anonymous' if it does not exist echo $user = $_GET["user"] ?? "anonymous"; echo("<br>"); // variable $color is "red" if $color does not exist or is null echo $color = $color ?? "red"; ?> </body> </html>
anonymous
red