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Problem with php fetching data from mysql

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Release： 2016-08-31 08:41:06
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Can the data obtained only be output through mysql_fetch_array using a while loop? For example, the data I retrieve is order by id. I only want the last piece of data, or the first piece of data. How do I get it? Actually, what I want to know is, what format is the data taken out by php... It feels very strange

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