Zebra + PHP + Linux Printer

Question

I am generating a PHP file with ZPL commands and sending it to the printer via linux command lpr -P, the problem is that in the printer is being printed the commands that are in the file and not the formatted label. Does anyone have any idea what might be going on?

Follows used code!

$lc_nome = 'rel_etiqueta.prn';
$lc_handle = fopen($_SERVER['DOCUMENT_ROOT'] . '/tmp/' . $lc_nome, 'w+');

/*
if(empty({etiquetas_por_item})||{etiquetas_por_item==0})
{
  {etiquetas_por_item} = 1;
}
*/

//var_dump([total_selecionados]);

for($x=0;$x<$tot;$x++)
{

  $linha  = explode('#', [total_selecionados][$x]);

  fputs($lc_handle,'^XA');
  fputs($lc_handle,'^MMT');
  fputs($lc_handle,'^PW831');  
  fputs($lc_handle,'^LL0240');  
  fputs($lc_handle,'^LS0 ');  
  fputs($lc_handle,'^FX  Produto Coluna 1');
   
  $nome_item    = '^FT40,60^A0N,40,30^FD'.  $linha[0] .'^FS';
  fputs($lc_handle,$nome_item);

  $codigo_item  = '^FO40,80^BC^FD'       .  $linha[1] .'^FS';
  fputs($lc_handle,$codigo_item);
  
  fputs($lc_handle,'^PQ1,0,1,Y^XZ');
  fputs($lc_handle,'^XA^ID000.GRF^FS^XZ');
  fputs($lc_handle,'^XA^ID001.GRF^FS^XZ');
  
}
        
fclose($lc_handle);

echo '</br>===== ' .  $itens . ' ===== </br>';

//$arquivo = '<a href="/tmp/rel_etiqueta.prn" target="_blank">abrir</a>';
$lc_arquivo = $_SERVER['DOCUMENT_ROOT'] . '/tmp/' . $lc_nome;
//$command = "lpr -P " . {IMPRESSORA} . " " . $lc_arquivo;
$command = "lpr -P " . 'zebra' . " " . $lc_arquivo;

//var_dump($comando);


exec($command);