Once you have a few variables you can make operations with them:

$base = 20;$height = 10;

$area =$base * $height;  The * I used to multiply$base per $height is the multiplication operator. We have quite a few operators, let’s do a quick roundup of the main ones. To start with, here are the arithmetic operators: +, -, *, / (division), % (remainder) and ** (exponential) We have the assignment operator =, which we already used to assign a value to a variable. Next up we have comparison operators, like <, >, <=, >=. Those work like they do in math. 2 < 1; //false 1 <= 1; // true 1 <= 2; // true  == returns true if the two operands are equal. === returns true if the two operands are identical. What’s the difference? You’ll find it with experience, but for example 1 == '1'; //true 1 === '1'; //false  We also have != to detect if operands are not equal: 1 != 1; //false 1 != '1'; //false 1 != 2; //true //hint: <> works in the same way as !=, 1 <> 1  and !== to detect if operands are not identical: 1 !== 1; //false 1 !== '1'; //true  Logical operators work with boolean values: // Logical AND with && or "and" true && true; //true true && false; //false false && true; //false false && false; //false true and true; //true true and false; //false false and true; //false false and false; //false // Logical OR with || or "or" true || true; // true true || false //true false || true //true false || false //false true or true; // true true or false //true false or true //true false or false //false // Logical XOR (one of the two is true, but not both) true xor true; // false true xor false //true false xor true //true false xor false //false  We also have the not operator: $test = true

!$test //false  I used the boolean values true and false here, but in practice you’ll use expressions that evaluate to either true or false, for example: 1 > 2 || 2 > 1; //true 1 !== 2 && 2 > 2; //false  All of the operators listed above are binary, meaning they involve 2 operands. PHP also has 2 unary operators: ++ and --: $age = 20;
$age++; //age is now 21$age--;
//age is now 20


## One more thing! ⚠️ ✋

At the end of January I will organize the Web Development Bootcamp.

It's a 10-weeks long cohort online course where I will guide you to becoming a Web Developer.

It's not "just a course". It's a big event I organize once a year.

We'll start from zero, learn the fundamentals of Web Development, HTML CSS, JavaScript, Tailwind, Git, using the command line, VS Code, GitHub, Node.js, we'll then learn React, JSX, how to use PostgreSQL, Astro, Next.js, Prisma, deploying on Netlify/DigitalOcean/Fly/Vercel and much more!

At the end of the first 10 weeks you'll know how to create web sites and web applications and I'll unlock you the 2nd phase of the Bootcamp: you will get access to a large number of projects exclusive to the Bootcamp graduates, so you can follow my instructions to build things like private areas with authentication, clones of popular sites like Twitter YouTube Reddit, create e-commerce sites, and much much more.

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To find out more, visit bootcamp.dev