php - 除了最后一个以外，天数都用逗号显示

Question

我有以下 if 语句，这些语句收集了在显示之前选择的所有日期。

$daysUsed = "";

if($this->dayweeksunsession==1){
    $daysUsed .= "Su ";
}

if($this->dayweekmonsession==1){
    $daysUsed .=  "M ";
}

if($this->dayweektuessession==1){
    $daysUsed .=  "T ";
}

if($this->dayweekwedsession==1){
    $daysUsed .=  "W ";
}

if($this->dayweekthurssession==1){
    $daysUsed .=  "Th ";
}

if($this->dayweekfrisession==1){
    $daysUsed .=  "F ";
}

if($this->dayweeksatsession==1){
    $daysUsed .=  "Sa ";
}

if($daysUsed !=="") {
    echo "</span><br/>Days of the Week: <span class='BoxReviewOutput'>";
    echo $daysUsed;
}

我的问题是，我怎样才能做到这一点，以便在 session 中选择的一周中的每一天都显示逗号，最后一天除外。

例如:选择了星期日和星期二。所以会显示“Su, T”

提前致谢!

Answer 1

使用implode()

$days = array("Su", "M", ....., "Sa");
echo implode(",", $days);