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cannot modify header information


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Hi. I am relatively new to PHP.

I'm trying to make a user authentication, and sending the user to another page if succeeded, with the following code:


include ('../conexion.php');
$nombreUsuario = $_POST['nombreusuario'];
$password = $_POST['password'];
$consultaAdmin= "SELECT * FROM usuarios WHERE nombre_usuario = '$nombreUsuario' AND password = '$password' AND tipo = 'admin'";
$resultadoAdmin = mysqli_query($conn , $consultaAdmin);
$cantidad= mysqli_num_rows($resultadoAdmin);
if($cantidad==1) {
}else {


I am getting this error: 


string(8) "brsastre" string(10) "igor123123" 

Warning: Cannot modify header information - headers already sent by (output started at /Applications/MAMP/htdocs/recetario/admin/validar.php:7)...


If I remove var_dump's it works just fine.


Why is this happening?

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