count（）：参数必须是实现Countable的数组或对象

Question

I'm getting this warning on my website, im just getting the information is it IP available or not, it's work, its says it's unavailable but it shows an warning also about code, I searched about it, but none of those answers didn't help me. So the code is working, just want to get off this warning. Php 7.x doesn't support syntax like this? The problem is in if (count($test)==1).

$printers = file("printers.txt"); //input txt file with IP addresses in chosen order
    $number_of_printers = count ($printers);
    for ( $i = 0 ; $i < $number_of_printers ; $i++)
    {
    $ip=str_replace("
","",$printers[$i]);
    $ip=str_replace("","",$ip);
    $ip=str_replace("
","",$ip);
    $test=@get_headers("http://$ip");
    if (count($test)==1){

        //do stuff here
        echo "<div class='printerwrapper'<div class='location'>$ip is unavailable</div></div>";
        continue;
    }

Answer 1

When get_headers() fails it returns false and count(false) triggers that warning since PHP/7.2 (demo). The rationale is that counting a boolean false and getting 1 doesn't make much sense.

Perhaps you just want this:

if (!$test) {
    //do stuff here
    echo "<div class='printerwrapper'<div class='location'>$ip is unavailable</div></div>";
    continue;
}