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php在不赋值只声明变量的情况下值是多少?
- WBOYOriginal
- 2016-06-06 20:11:191385browse
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>
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