strange behavior on contact form - php

Question

I am having a strange problem with this form. I have made it yesterday night and it was working fine, sending all the emails as it should. However, I've run it today and it won't simply work at all. I am always getting the error message. Any clues? Thank you.
<?php
$name = $_POST['name'];
$email = $_POST['email'];
$subject = $_POST['subject'];
$message = $_POST['message'];
$depart = $_POST['departamento'];
$headers = "From: $email\r\n";
$headers .= "Reply-To: $email\r\n";
$corpo = "Nova Mensagem\n";
$corpo .= "De: " . $name . "\n";
$corpo .= "Email: " . $email . "\n";
$corpo.=" Para o departamento " . $depart. "\n";
$corpo .= "Mensagem: " . $message . "\n";
if ($depart = administrativo)
{
$email_to = '';
}
elseif ($depart = financeiro)
{
$email_to = '';
}
elseif ($depart = Suporte)
{
$email_to = '';
}
else
{
$email_to = '';
}
$status = mail($email_to, $subject, $corpo, $headers);
if($status) {
echo "<script> window.location.href = ''; </script>";
}
else {
echo "<script> window.location.href = ''; </script>";
}
?>

Answer 1

Instead of = use == for comparison
for example - instead of:
if( $depart = administrativo)
use
if( $depart == "administrativo" )

Answer 2

You should enclose strings within quotes. Moreover, == (comparing objects of different types) && === (comparing objects of same types) are used for comparing and = is used for assigning. So, change the code as follows (inside the if statements) :
if ($depart == 'administrativo')
{
$email_to = '';
}
elseif ($depart == 'financeiro')
{
$email_to = '';
}
elseif ($depart == 'Suporte')
{
$email_to = '';
}
else
{
$email_to = '';
}