How to Compare three strings?

[spires]

HI.

 

 

Can anyone tell how i go about comparing three strings

to see if they are the same?

 

I'm building an Email list system, where users can upload

three of their friends Emails.

 

I want to check, to make sure they don't load up the same

Email three times.

 

I was thinking something like this, But  strcmp only compares

two strings. I need to compare three

strcmp (string $email1, string $email2, string $email3)

 

 

Any help would be great

 

Thanks

[hitman6003]

if ($email1 == $email2 == $email3) {
  //do something
}

[Orio]

That won't work hitman.

 

<?php

if($str1 == $str2 && str2 == $str3)
{
   //They are the same
}

?>

 

 

Orio.

[spires]

Cheers guys,

 

Thats great.

 

I knew it had to be somthing like that.

 

Thanks once again.

[clown[NOR]]

i'm not sure... but maybe if you make your own function (ex: compEmail($strin1,$string2,$string3))

 

<?php

function compEmail($email1,$email2,$email3)
{

if ($email1 == $email2 || $email1 == $email2) { return false; }
if ($email2 == $email1 || $email2 == $email3) { return false; }
if ($email3 == $email1 || $email3 == $email2) { return false; }
else { return true; }

}

?>

 

then you can use this:

<?php

$compEmail = compEmail($email1,$email2,$email3);
if ($compEmail) { 

// it's ok, continue the script

} else {

// one or more emails were the same

}

?>

 

be aware... it's not tested.. but it should get you started...

[Barand]

~clown

 

If a==b it follows that b==a, so you only need 3 tests for duplicates, not 6.

 

if ((a==b) || (b==c) || (a==c)) return false

 

And what if the user only wants to email a single friend, so b and c are both blank?

[clown[NOR]]

well... before comparing you must rule out any blank fields...

 

if (!empty($email1) && !empty($email2) && !empty($email3)) { compare them all }

 

etc

 

but about the ((a==b) || (b==c) || (a==c)) ... thanks for clearing that up for me... looks like i need to rewrite some codes myself