(PHP 4 >= 4.3.0, PHP 5)
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link_identifier
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mysql_ping()
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mysql_ping() 锟斤拷锟斤拷 TRUE锟斤拷锟斤拷锟津返伙拷 FALSE锟斤拷
锟轿硷拷 mysql_thread_id() 锟斤拷 mysql_list_processes()锟斤拷