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php在不赋值只声明变量的情况下值是多少?

WBOY
Release： 2016-06-06 20:11:19
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是默认的null吗?

回复内容：

是默认的null吗?

写代码自己调试

<code><?php $a;
var_dump($a);
</code></code>
Copy after login

php在不赋值只声明变量的情况下值是多少?

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