PHP if else help

Hello, well, I need some more help! (I'll use this thread now if I need any help if that's okay!)

I am making a website where people can make accounts, and post on there wall, like facebook, but, you know, different!

And, I want to do something like this, but since I cba setting up the database and testing, I just would like to know if I can get help with this:

I would like to know how to do an 'if and else' statement, IE:

PHP Code:

---

if $username = Swag
{
mysql_query("UPDATE users SET post_colour = Black WHERE username = $username");
} else {
if $loggedin = False
{
header('Location: http://site.com/login');
} else {
echo'you have no access to this section!'; 


---

PHP Code:

---

if($username == "Swag"){ // The text 'Swag' is a string and needs to be in quotes

    mysql_query("UPDATE users SET post_colour = Black WHERE username == $username"); 
    
}

if($loggedin == false){ // true/false don't need to be inside of quotes

    header('Location: http://site.com/login');

}else{

    echo "You have no access to this section!";

} 


---

Also for storing login information I would recommend using PHP Sessions - w3Schools.

Edit: Just noticed you were using equal signs a bit wrong. A single equal sign is used to assign a value to something:

PHP Code:

---

$name = "Billy"; // Set the value of the variable name to 'Billy" 


---

Whereas a double equal sign is used to compare two values:

PHP Code:

---

$name = "Billy"; // Set the value of the variable name to 'Billy"

if($name == "Billy"){ // Check if variable name's value is equal to 'Billy'
    echo "Your name is billy!";
}

if($name != "Billy"){ // Check if variable name's value is not equal to 'Billy'
    echo "Your name is not billy, it is <b>".$name."</b>!";
} 


---

PHP Code:

---

if ($username = Swag) 
{ 
mysql_query("UPDATE users SET post_colour = Black WHERE username = $username");
$loggedin = True; 
} else {  
echo'you have no access to this section!'; }

if ($loggedin!=True) { header('Location:http://omgee.omg/login.php') } else { header('Location:http://omgee.omg/supercoolcontrolpanel.php') } 


---

However , I'd use session_start , session_register , or else people will still be able to directly access http://omgee.omg/supercoolcontrolpanel.php

Quote:

---

Originally Posted by billybombill

PHP Code:

---

if($username == "Swag"){ // The text 'Swag' is a string and needs to be in quotes

    mysql_query("UPDATE users SET post_colour = Black WHERE username == $username"); 
    
}

if($loggedin == false){ // true/false don't need to be inside of quotes

    header('Location: http://site.com/login');

}else{

    echo "You have no access to this section!";

} 


---

Also for storing login information I would recommend using PHP Sessions - w3Schools.

Edit: Just noticed you were using equal signs a bit wrong. A single equal sign is used to assign a value to something:

PHP Code:

---

$name = "Billy"; // Set the value of the variable name to 'Billy" 


---

Whereas a double equal sign is used to compare two values:

PHP Code:

---

$name = "Billy"; // Set the value of the variable name to 'Billy"

if($name == "Billy"){ // Check if variable name's value is equal to 'Billy'
    echo "Your name is billy!";
}

if($name != "Billy"){ // Check if variable name's value is not equal to 'Billy'
    echo "Your name is not billy, it is <b>".$name."</b>!";
} 


---

---

Thanks for your help, was great! If I require more help, would me PM'ing you would be fine? :thumbup:

Also, would this work, too? (that represents a false, right?)

PHP Code:

---

if($loggedin != true) 


---

Quote:

---

Originally Posted by Swag

Thanks for your help, was great! If I require more help, would me PM'ing you would be fine? :thumbup:

Also, would this work, too? (that represents a false, right?)

PHP Code:

---

if($loggedin != true) 


---

---

No problem :D And sure, Email/skype/PM would be fine

Edit: and yes, that would mean does not equal, so anything besides true

This is the same, but more expecific.

PHP Code:

---

if($username == "Swag" && $loggedin) // If username is Swag and is logged in
    mysql_query("UPDATE users SET post_colour = 'Black' WHERE username == "'.$username.'""); 
else if(!$loggedin) // if it's not logged in
    header('Location: http://site.com/login');
else // If it's not Swag and not logged in
    echo "You have no access to this section!"; 


---

Quote:

---

Originally Posted by caja

This is the same, but more expecific.

PHP Code:

---

if($username == "Swag" && $loggedin) // If username is Swag and is logged in
    mysql_query("UPDATE users SET post_colour = 'Black' WHERE username == "'.$username.'""); 
else if(!$loggedin) // if it's not logged in
    header('Location: http://site.com/login');
else // If it's not Swag and not logged in
    echo "You have no access to this section!"; 


---

---

Correct me if I'm wrong, but that is not precisely true.

PHP Code:

---

if($username == "Swag" && $loggedin) // Checks if the username is "Swag" and if he is logged in.
    mysql_query("UPDATE users SET post_colour = 'Black' WHERE username == "'.$username.'""); 
else if(!$loggedin) // Checks if the user is not logged in
    header('Location: http://site.com/login');
else // The exact same thing as above. 
    echo "You have no access to this section!"; 


---

Read the comments.

Now, to do it like you said/wanted to you'd have to do it like this:

PHP Code:

---

if($username == "Swag") { // if the username is "Swag"
    if ($loggedin) // If "Swag" is logged in
        mysql_query("UPDATE users SET post_colour = 'Black' WHERE username == "'.$username.'""); 
    else // If "Swag is not logged in
        header('Location: http://site.com/login');
} else // If the username is not "Swag"
    echo "You have no access to this section!"; 


---

The difference between the two is that your example, the else if statement only checks if the user is logged in or not, and not if the user is Swag. Meaning every user who is not logged in will get to see 'http://site.com/login'. In this case the else is pretty much the same as the else if since $loggedin is most likely a boolean.

Thanks for the help, was great!