How to analyze the Mysql error caused by php's slow log

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Problem: when executing the program, it will report 2013 (Lost connection to MySQL server during query)

Analysis:

1) in our daemon, a loop is executed (> 300 times) and a SQL statement is repeated in the loop

2) the access log of Nginx. Each execution time of the program is about 12 seconds.

3) modify the mysql connection class. Before query, the execution of mysql_ping is also invalid, and the problem remains.

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