On the problem of tr serial number of table form

as shown in the figure: if there is such data, it is looped out and rendered into the table, and the "serial number" is required, but it is not clear how to make the number of data rows in the children array 2

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:

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1be9b98-306e6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be9b98-306e6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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