Changing Global MySql Variables

I am relatively new to php and MySQL and on a site I was told I need to set the value of group_concat_max_len=9999999.

Can someone please help me out and let me know where I need to do this? Is it something done in mySQL or in my php code. Can I do it immediately after connecting to the database and does it stay until the connection is closed or do I need to set it before the call that needs to have the value changed?

Thanks for any help.

Carol
 
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