如何检查数组中的每个值是空的？

If I have an array:

$nav = array($nav_1, $nav_2, $nav_3);

and want to check if they are empty with a loop (the real array is much bigger), so that it checks each variable separately, how do I do it?

I want something like this;

$count = 0;

while(count < 3){
     if(empty($nav[$count])) //the loops should go through each value (nav[0], nav[1] etc.)
          //do something
          $count = $count+1;
     }else{
          //do something
          $count = $count+1;
     }
}

Pretty straight-forward with a foreach loop:

$count = 0;
foreach ($nav as $value) {
    if (empty($value)) {
        // empty
        $count++;
    } else {
        // not empty
    }
}

echo 'There were total ', $count, ' empty elements';

If you're trying to check if all the values are empty, then use array_filter():

if (!array_filter($nav)) {
    // all values are empty
}

With the following code you can check if all variables are empty in your array. Is this what you are looking for?

$eachVarEmpty = true;

foreach($nav as $item){
    // if not empty set $eachVarEmpty to false and go break of the loop
    if(!empty(trim($item))){
        $eachVarEmpty = false;
        // go out the loop
        break;
    }
}

$empty = array_reduce($array, function(&$a,$b){return $a &= empty($b);},true);