On the algorithm of getting the largest picture by link download

is the one I download the picture through a link, but want to get the largest picture, what to do?

http://www.noitom.com.cn/wp-c.
http://www.noitom.com.cn/wp-c.

how to compare the size of the two downloaded pictures

Dec.12,2021
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-64f5-1b3bf64-2c2e1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3bf64-2c2e1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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