Question

I have this page table below and I want to remove the numbering prefix of ‘999‘ from the column of template_id,

page_id    template_id    url
1          9991           a
2          9992           b
3          9993           c
4          4              d

so I can get the updated data below,

page_id    template_id    url
1          1              a
2          2              b
3          3              c
4          4              d 

Any idea how I can remove this kind of prefix?

Answer 1

If you don’t want to make a complex query or if you need futher operation you can do:

while($r = mysql_fetch_assoc($q)) {
   $newTemplateID = (string) $r['template_id'];
   if (substr($newTemplateID,0,3) === 999 ) {
     $newTemplateID = substr($newTemplateID,3);

     mysql_query("UPDATE tbl 
                    SET template_id = {$newTemplateID} 
                    WHERE page_id = {$r['page_id']} 
                    LIMIT 1");
   }
}