PHP: The best way to check if 3 variables are identical?

Question

Forgive me if this is a common thing but I\'m not sure how I should go about it.

I would like to see if three variables are identical to each other

I thought

Answer 1

Dont think you can do it simpler then:

if ($one == $two && $two == $three)

Answer 2

I would use:

if ( $one === $two && $two === $three )
    echo "they all match."
else
    echo "one of these variables do not match.";

• #1 == #2 (no type coercion)
• #2 == #3 (no type coercion)
• ∴ #1 == #2 == #3

Answer 3

You have you use &&. Fortunately, by the transitive property of ==, you only have to check two out of three :).

if ($one == $two && $two == $three) {
    echo "they all match.";
} else {
    echo "one of these variables do not match."; 
}

Want a "do what I mean" language? Use Python.

>>> a = 'foo'
>>> b = 'foo'
>>> c = 'foo'
>>> a == b == c
True

Answer 4

Here's an alternative solution that might be helpful. It will be particularly useful if your variables are already in an array.

$a = array($one, $two, $three);

if(count(array_unique($a)) == 1){
  // all match
}
else {
  // some items do not match
}