public function renderCallStackItem($file, $line, $class, $method, $args, $index)
{
$lines = [];
$begin = $end = 0;
if ($file !== null && $line !== null) {
$line--;
// adjust line number from one-based to zero-based
$lines = @file($file);
if ($line < 0 || $lines === false || ($lineCount = count($lines)) < $line) {
return '';
}
$half = (int) (($index === 1 ? $this->maxSourceLines : $this->maxTraceSourceLines) / 2);
$begin = $line - $half > 0 ? $line - $half : 0;
$end = $line + $half < $lineCount ? $line + $half : $lineCount - 1;
}
return $this->renderFile($this->callStackItemView, ['file' => $file, 'line' => $line, 'class' => $class, 'method' => $method, 'index' => $index, 'lines' => $lines, 'begin' => $begin, 'end' => $end, 'args' => $args]);
}
