Operators

Arithmetic uses + - * / % **; strings join with .. Prefer strict === and !==; == coerces. The spaceship operator <=> returns ordering, and logical operators short-circuit.

Practical example

<?php
$display = $input['name'] ?? 'Anonymous';
$allowed = $authenticated && $role === 'editor';
$total += $price * $quantity;
$label = $first . ' ' . $last;

?? handles unset/null array entries, while ?-> stops member access on null. Textual and and or have unexpectedly low precedence. Parenthesize mixed logic and do not use error suppression @ as control flow.