php - Returning a value depending on number of rows returned from SQL query -


i'm new php , sql , i'm trying write function return true if sql query returns @ least 1 result.

what have far 

function isnew($cannum)   {   connecttodatabase();     select count(*) cnt    'cans' c    c.date >= date_sub(now(), interval 1 day)    , c.canid = '$cannum';    disconnectdatabase();   //return true if above returns row    disconnectdatabase();   }

my question how return since count not php variable can < comparison with.

function isnew($cannum)   { if (count(mysql_fetch_assoc(mysql_query("    select count(*) cnt    'cans' c    c.date >= date_sub(now(), interval 1 day)    , c.canid = '$cannum'; ")))>0) { return true; } else { return false; }   }

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