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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Classes</title>
<meta name="description" content="">
<link rel="stylesheet" href="/css/site.css">
<link rel="icon" href="/favicon-32.png">
<script src="/js/site.js"></script>
</head>
<body>
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<div class="container center">
<h1>Classes</h1>
<h3 class="subtitle">Object-oriented programming</h3>
<div class="grid-code"><div class="doc"></div><div class="code"><pre><code class="language-php">&lt;?php
</code></pre></div><div class="doc">Classes allow you to define your own data types. All classes start with the class keyword followed by the name of the class and opening and closing curly braces.</div><div class="code"><pre><code class="language-php">class Car
{
}
</code></pre></div><div class="doc">To create an instance of a class, you use the &quot;new&quot; keyword in front of the class name with parentheses.</div><div class="code"><pre><code class="language-php">$car = new Car();
</code></pre></div><div class="doc">A class can define attributes and methods. An attribute is a piece of data stored on the class instance. You can define an attribute by adding the word &quot;public&quot; and a variable name inside the class definition.</div><div class="code"><pre><code class="language-php">class Bicycle
{
public $color;
}
</code></pre></div><div class="doc">Then, when you create an instance of the class, you can set and use the color attribute on the bicycle using &quot;-&gt;&quot;.</div><div class="code"><pre><code class="language-php">$bike = new Bicycle();
$bike-&gt;color = 'Blue';
echo $bike-&gt;color . &quot;\n&quot;;
</code></pre></div><div class="doc">A method is a function attached to the class. You can add a method to a class by using the &quot;public&quot; keyword followed by the function. A method can access the attributes and methods of the instance using the &quot;$this&quot; variable.</div><div class="code"><pre><code class="language-php">class Tricycle
{
public $color;
public function echoColor()
{
echo $this-&gt;color . &quot;\n&quot;;
}
}
$bike = new Tricycle();
$bike-&gt;color = 'Red';
$bike-&gt;echoColor();
</code></pre></div></div>
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<div class="table-of-contents">
<h4>Table of Contents</h4>
<a href="/index.html">Preface</a>
<ol>
<li><a href="/basics.html">Basics</a></li>
<li><a href="/variables.html">Variables</a></li>
<li><a href="/arithmetic.html">Arithmetic</a></li>
<li><a href="/comparisons.html">Comparisons</a></li>
<li><a href="/boolean-logic.html">Boolean Logic</a></li>
<li><a href="/conditionals.html">Conditionals</a></li>
<li><a href="/loops.html">Loops</a></li>
<li><a href="/arrays.html">Arrays</a></li>
<li><a href="/functions.html">Functions</a></li>
<li><a href="/classes.html">Classes</a></li>
</ol>
<a href="/credits.html">Credits</a>
</div>
</div>
</div>
</body>
</html>