Código PHP:
// Vuelvo al from.
$address="Location:subir_img_esp.php?id=".$idafil;
header($address);
Warning: Cannot modify header information - headers already sent by (output started at /home/content/a/m/p/prueba/html/usuario/validar.php:1) in /home/content/a/m/p/prueba/html/usuario/subir_img_esp.php on line 132
porque sera ????