If else not working properly - php

Question

So I made page with unban request and in users table I save if user already sent request or not so I don't have multiple unban requests from one user.Now when I check if user sent request it's not working.In database it stands 0 and it's still showing me error pop out.
Here is code, thanks for help in advance
if(isset($_POST['btn-unban_req']))
{
if($unban_sent = 0)//THIS IS WHERE I CHECK
{
//MY THIGNS HERE
if($connection ->query($unbanquery) === TRUE)
{
//MY THIGNS HERE
if ($connection->query($sentquery) === TRUE)
{
}
else
{
echo $connection->error;
}
}
else
{
}
}
else // AND I GET THIS ERROR EVEN IF IT STANDS 0 IN DATABASE
{
echo "Unban already sent!";
}
}

Answer 1

You are not comparing the values, this is assigning the values:
if($unban_sent = 0) // assigning values
This should be:
if($unban_sent == 0) // comparing values
Basic Example:
Lets say,
1 = 1 its assigning
1 == 1 its checking the condition will return TRUE.
For more help: PHP Comparison Operators

Answer 2

You're using this code which is wrong.
$unban_sent = 0
$unban_sent = 0 means to assign 0 to $unban_sent
It should be:
$unban_sent == 0
$unban_sent == 0 means $unban_sent is equal to 0
== is for comparison, = is for assignment, and === is for identical or same type.
More information at http://php.net/manual/en/language.operators.comparison.php.

Answer 3

In line 3 you missed a = for comparision. Instead, you set $unban_set to 0
Try it with this code:
if(isset($_POST['btn-unban_req']))
{
if($unban_sent == 0) //<- Now you are checking it here
{
//MY THIGNS HERE
if($connection ->query($unbanquery) === TRUE)
{
//MY THIGNS HERE
if ($connection->query($sentquery) === TRUE)
{
}
else
{
echo $connection->error;
}
}
else
{
}
}
else // AND I GET THIS ERROR EVEN IF IT STANDS 0 IN DATABASE
{
echo "Unban already sent!";
}
}