PHP获取某个时间戳是周几

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$time = time();

$week = date("w",$time);

$array = ["周日","周一","周二","周三","周四","周五","周六"];

echo $array[$week];

0 => 周日，1 => 周一，2 => 周二，3 => 周三，4 => 周四，5 => 周五，6 => 周六