socket 数据无长度无结尾符,怎么判断接收报文齐了

$arr = json_decode ($json, true);
echo "<pre>";
print_r($arr);
echo "</pre>";
$values = array();
foreach ($arr as $k => $v) {
$values[] = "'" . $v['openid'] . "', " . $v['opercode'] . ", " . $v['text'] . "," . $v['time'] . "," . $v['worker'] . "";
}