php - How to effectively replace (mysql_result(mysql_query()) in PDO? -

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as process complete rewriting web pdo instead of mysql_* commands testing changed functions. , seems changed function mysql_result(mysql_query() returns true, why that? lets see original , changed code:

if (mysql_result(mysql_query("select count(*) account id='".$_session["user_id"]."' , online=1"), 0)>0) {   return true;  } else   return false;

and changed code here:

$stmt = $db_login->prepare("select count(*) account id=:id , online=1"); $stmt->bindvalue(':id', $_session["user_id"], pdo::param_int); $stmt->execute(); $results_login = $stmt->fetch(pdo::fetch_assoc); $rows = count($results_login); if ($rows > 0) {   return true;  } else   return false;

so wrong why returns true when column has online=0? thank you

$stmt->fetch fetches one row result set. out of array containing selected columns, looking this:

array(     'count(*)' => 42 )

a count() on array result in 1.

you need check contents of fetched row:

if ($result_login['count(*)'] > 0)

it's best alias column nicer name:

select count(*) `count` ...

then:

if ($result_login['count'] > 0)

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