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<?php

$logFile = fopen('test.txt', 'r');
$lastLine = '';

if ($logFile) {
  $cursor = -1;
  fseek($logFile, $cursor, SEEK_END);
  $char = fgetc($logFile);

  // trim trailing newline chars of the file
  while ($char === "\n" || $char === "\r") {
  fseek($logFile, $cursor--, SEEK_END);
    $char = fgetc($logFile);
  }

  // read until the start of file or first newline char
  while ($char !== false && $char !== "\n" && $char !== "\r") {
    $lastLine = $char . $lastLine;
    fseek($logFile, $cursor--, SEEK_END);
    $char = fgetc($logFile);
  }
}