如何检查GET是否为空？

Question

I am setting some vars from GET

$start = $_GET['start']; 
$end = $_GET['end'];

From which I get:

start=1-11-2018&end=30-11-2018

And then I am doing:

if((!$start) && (!$end)) {
  if (($dateFormat >= $start) && ($dateFormat <= $end)) {
} else {
    echo "no dates";
}

And to close it

if((!$start) && (!$end)) {
   }
} 

But this isn't happening

if((!$start) && (!$end)) {

UPDATE

Now this is working but it doesn't go in else if no GET

if((!empty($_GET['start'])) && (!empty($_GET['end']))) {
   if (($dateFormat >= $start) && ($dateFormat <= $end)) {
} else {
    echo "No dates";
}

Answer 1

Check via isset()

if you are calling : http://example.com?start=1-11-2018&end=30-11-2018

 1. The isset() is checking query string "start"/"end" is having or not. 2. The empty() is checking query string "start"/"end" is empty/blank or not 

if( isset($_GET['start']) && isset($_GET['end']) ){ // check the GET method is set or not

    if((!empty($_GET['start'])) && (!empty($_GET['end']))) {
       if (($dateFormat >= $start) && ($dateFormat <= $end)) {
    }
    else {
        echo "Empty dates";
    }
}
else{
    echo "Start / End date query string is missing...";
}

Answer 2

This is how I resolved it:

if((!empty($start)) && (!empty($end))) {
    if (($dateFormat >= $start) && ($dateFormat <= $end)) {
} 
   // here the content which 
  // in case those vars are not empty, 
 // would get filtered by that logic. 

if((empty($start)) && (empty($end))) {
  // Close the condition for second if when not empty
} else {
   echo "No dates";
}