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95 lines
4.1 KiB
HTML
95 lines
4.1 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>Classes</title>
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<meta name="description" content="">
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<link rel="icon" href="/favicon-32.png">
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<script src="/js/site.js"></script>
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<body>
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<div class="menu">
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<button class="menu-button" title="Open Menu">
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<div class="icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20"><path d="M0 3h20v2H0V3zm0 6h20v2H0V9zm0 6h20v2H0v-2z"/></svg></div>
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</div>
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<div class="container center">
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<h1>Classes</h1>
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<h3 class="subtitle">Object-oriented programming</h3>
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<div class="grid-code"><div class="doc"></div><div class="code"><pre><code class="language-php"><?php
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</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
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{
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}
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</code></pre></div><div class="doc">To create an instance of a class, you use the "new" keyword in front of the class name with parentheses.</div><div class="code"><pre><code class="language-php">$car = new Car();
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</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 "public" and a variable name inside the class definition.</div><div class="code"><pre><code class="language-php">class Bicycle
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{
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public $color;
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}
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</code></pre></div><div class="doc">Then, when you create an instance of the class, you can set and use the color attribute on the bicycle using "->".</div><div class="code"><pre><code class="language-php">$bike = new Bicycle();
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$bike->color = 'Blue';
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echo $bike->color . "\n";
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</code></pre></div><div class="doc">A method is a function attached to the class. You can add a method to a class by using the "public" keyword followed by the function. A method can access the attributes and methods of the instance using the "$this" variable.</div><div class="code"><pre><code class="language-php">class Tricycle
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{
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public $color;
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public function echoColor()
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{
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echo $this->color . "\n";
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}
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}
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$bike = new Tricycle();
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$bike->color = 'Red';
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$bike->echoColor();
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</code></pre></div></div>
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<div class="table-of-contents">
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<h4>Table of Contents</h4>
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<a href="/index.html">Preface</a>
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<ol>
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<li><a href="/basics.html">Basics</a></li>
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<li><a href="/variables.html">Variables</a></li>
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<li><a href="/arithmetic.html">Arithmetic</a></li>
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<li><a href="/comparisons.html">Comparisons</a></li>
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<li><a href="/boolean-logic.html">Boolean Logic</a></li>
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<li><a href="/conditionals.html">Conditionals</a></li>
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<li><a href="/loops.html">Loops</a></li>
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<li><a href="/arrays.html">Arrays</a></li>
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<li><a href="/functions.html">Functions</a></li>
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<li><a href="/classes.html">Classes</a></li>
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</ol>
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<a href="/credits.html">Credits</a>
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</div>
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</div>
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</div>
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</body>
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</html>
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