PHP: operators

Operators combine values, calculate results, assign data, and compare conditions in PHP.

What you will learn

How arithmetic and assignment operators change values
How comparison operators produce true or false
Why strict comparisons are safer when types matter

Common groups

Arithmetic: + - * / % calculate numbers.
Assignment: = stores a value; += updates it.
Comparison: === checks value and type; !== checks that they differ.
Logical: &&, ||, and ! combine conditions.

<?php $age = 20; if ($age >= 18 && $age < 65) { echo 'Working-age example'; } ?>

Use parentheses when they make the intended grouping clearer.

Common mistakes

Prefer === and !== when automatic type conversion would be surprising.
Do not use assignment = where a comparison was intended.
Validate external input before converting it or using it in a condition.