如何在PHP的關聯數組中獲取空​​值的鍵

Question

我正在驗證php中的html表單，我想打印出一個空字段的關鍵字，

$url = $_POST['url']; $start_time = $_POST['start_time']; $end_time = $_POST['end_time'];

$arr = array("Url"=>"$url","Start Time"=>"$start_time","End Time"=> "$end_time");

Answer 1

代替....

$url = $_POST['url']; $start_time = $_POST['start_time']; 
$end_time = $_POST['end_time'];

我建議

$err =0;
 // repeat following block for every mandatory input
if ((isset($_POST['url']) && (!empty($_POST['url']))){
$url = $_POST['url'];
} else {$err++;  $errmsg .='You need to enter a URL<br>';}

...

if ($err > 0){
echo $errmsg;
} else {
// process submitted form 
}

例如，我更喜歡先查找錯誤，然后再對用戶提供的變量執行任何操作。