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$site = isset($site) ? $site : "未定义";
益伦的博客
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691 people have browsed it
<?php

$site = isset($site) ? $site : "未定义";

echo $site.'<br>';
$site = isset($site) ? $site : "php.cn";
echo $site;

输出结果 =》
未定义
未定义
$site = isset($site) ? $site : "未定义";
相当于给$site初始化了


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