php在foreach之后返回一个空数组

Question

Can I avoid the empty array that generate by foreach ?
here is my code

$file="test.txt";
$open = file_get_contents($file);
$lines = explode(PHP_EOL, $open);
foreach($lines as $line){
    $domain = preg_split('/\s+/', $line,-1,PREG_SPLIT_NO_EMPTY);
    echo "<pre>";
    var_dump($domain);
    echo "$domain[0] OK";
    echo "</pre>";
}

test.txt contains this

www.google.com  2.2.2.3
www.test.com    2.2.2.3
www.example.com 2.2.2.3

after I ran my script the result is this

array(2) {
  [0]=>
  string(14) "www.google.com"
  [1]=>
  string(7) "2.2.2.3"
}
www.google.com OK
array(2) {
  [0]=>
  string(12) "www.test.com"
  [1]=>
  string(7) "2.2.2.3"
}
www.test.com OK
array(2) {
  [0]=>
  string(15) "www.example.com"
  [1]=>
  string(7) "2.2.2.3"
}
www.example.com OK
array(0) {
}
 OK

What cause the array(0) to appear?
There's no new line after www.example.com or other element.
Can I remove it or simply don't get it generated?

Answer 1

There's an extra linebreak or other whitespace character after the last domain.

Trim the text file contents first:

$open = trim(file_get_contents($file));

You could also check if the line isn't empty inside the loop.

$file="test.txt";
$open = trim(file_get_contents($file));  // Either this..
$lines = explode(PHP_EOL, $open);
foreach($lines as $line){

    if ($line === '') // Or this
        continue;


    $domain = preg_split('/\s+/', $line,-1,PREG_SPLIT_NO_EMPTY);
    echo "<pre>";
    var_dump($domain);
    echo "$domain[0] OK";
    echo "</pre>";
}