Equals signs

gistfile1.php

<?php

// One means "Assign this value to this variable"
$number = 1; // This one is an integer (whole number)
$anotherNumber = "1"; // This one is a string

// Two means "Are these the same value?"
if ($number == $anotherNumber) {
    // This will be true
}

// Three means "Are these the same vale AND type?
if ($number === $anotherNumber) {
    // This will not be true, because although $number and $anotherNumber 
    // are both 1, one is an integer type and the other is a string type
}