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Operators
PHP contains all the normal operators one would expect to find in a programming language.
A single “=” is used as the assignment operator and a double “==” or triple “===” is used for comparison.
The usual “<” and “>” can also be used for comparison and “+=” can be used to add a value and assign it at the same time.
Most notable is the use of the “.” to concatenate strings and “.=” to append one string to the end of another.
New to PHP 7.0.X is the Spaceship operator (<=>). The spaceship operator returns -1, 0 or 1 when $a is less than, equal to, or greater than $b.
<?php
echo 1 <=> 1; // 0
echo 1 <=> 2; // -1
echo 2 <=> 1; // 1
Ternary Operators
If you need a very short, simple, easy maintaining that work just like if else statement then php give you ternary operator. A very poweful but easy operator. It looks like this - (?:). Simple, right? Lets get to examle.
Suppose you need to send a massage that if the user is logged in then say 'Hello user_name' if not then 'Hello guest'.
if we use if-else statement:
if($user == !NULL {
$message = 'Hello '. $user;
} else {
$message = 'Hello guest';
}
Using ternary operator:
$message = 'Hello '.($user == !NULL ? $user : 'Guest');
Both of them do exactly same thing. But the later one is easy for maintainance.