$str = "爸爸,妈妈,奶奶;爷爷.外公,外伯,舅舅";
$str = str_replace(';', ',', $str);
$str = str_replace('.', ',', $str);
$net = explode(',',$str);
var_dump($net);
$str = str_replace(';', ',', $str);
$str = str_replace('.', ',', $str);
$net = explode(',',$str);
var_dump($net);
print_r($net);
Array
(
[0] => 爸爸
[1] => 妈妈
[2] => 奶奶
[3] => 爷爷
[4] => 外公
[5] => 外伯
[6] => 舅舅
)