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为什么php mysql_num_rows函数前面需要加@符号啊？

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Release： 2016-06-06 09:35:37
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mysql_num_rowsmysqlphp 

<code> 在连接mysql时，需要用到mysql_connect， mysql_select_db, mysql_query等函数，这些函数前面可以不用加上@符号，但是mysql_num_rows前面需要加上@</code>
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这是怎么回事？

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