运行流程时`上下文中没有事务`错误(`No transaction in context` error when running a flow)

 如果没有任何FQL的专门知识，我会冒这个猜测。 它似乎是SQL，你通常可以一次只指定多个字段...... 
 
$pics  = array();
$ids   = array();
$names = array();
$sexs  = array();

$fql   = 'SELECT uid, name, pic_square, sex FROM user WHERE uid IN (SELECT uid2 FROM friend WHERE uid1 = me())';
$data  = $facebook->api(array('method' => 'fql.query','query' => $fql));
foreach ($data as $datum) {
    $pics[]  = $datum['pic_square'];
    $ids[]   = $datum['uid'];
    $names[] = $datum['name'];
    $sexs[]  = $datum['sex'];
}

Without any particular knowledge of FQL, I would hazard this guess; it seems to be SQL and you can normally just specify more than one field at a time...
 
$pics  = array();
$ids   = array();
$names = array();
$sexs  = array();

$fql   = 'SELECT uid, name, pic_square, sex FROM user WHERE uid IN (SELECT uid2 FROM friend WHERE uid1 = me())';
$data  = $facebook->api(array('method' => 'fql.query','query' => $fql));
foreach ($data as $datum) {
    $pics[]  = $datum['pic_square'];
    $ids[]   = $datum['uid'];
    $names[] = $datum['name'];
    $sexs[]  = $datum['sex'];
}