'Only last line of text file is read by foreach loop in PHP

I access a text file, which contains several lines (made like this: id||x||y||z).

Then I want to read each line and if the part y is equal to "something", I want to push it into the array $a.

It works, but only the last line of the text file is read by the foreach loop. What am I doing wrong?

<?php
$lines = file("myfile.txt");

$a = array();

foreach ($lines as $line){
  list($id,$x,$y,$z) = explode('||', $line);
  if ($y === "something"){
    $a[] = $y;
  }
}
?>
phparraysforeachtext-files


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