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88 lines
4.5 KiB
HTML
88 lines
4.5 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>Variables</title>
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</div>
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<div class="container center">
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<h1>Variables</h1>
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<h3 class="subtitle">The building blocks of PHP</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">The variable is the basic building block of any programming language. In PHP, all variables start with a dollar sign.</div><div class="code"><pre><code class="language-php">$greeting;
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</code></pre></div><div class="doc">To set data in a variable, you put an equals sign after it and some data.</div><div class="code"><pre><code class="language-php">$greeting = 'Hello World!';
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</code></pre></div><div class="doc">Once you create a variable, you can use it again in other commands and functions.</div><div class="code"><pre><code class="language-php">echo $greeting;
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</code></pre></div><div class="doc">After the dollar sign, a PHP variable must have an alphabetic character or underscore. Also, variables are case sensitive.</div><div class="code"><pre><code class="language-php">$_var = 'I am a variable with an underscore!';
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$Var = 'I am a variable with a capital letter!';
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$var = 'I am a new variable';
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</code></pre></div><div class="doc">Variables can hold many different types of data, but there are four simple ones you can try now. An int is a number without a decimal place. A float is a number with a decimal place. A boolean can be two values: true or false. Last, there is a string, a collection of characters.</div><div class="code"><pre><code class="language-php">$int = 1;
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$float = 100.10;
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$bool = true;
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$string = 'I am a string';
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</code></pre></div><div class="doc">In other programming languages, you have to write what type of data the variable will contain. PHP keeps it simple by allowing you to put any type of data in a variable, including already used variables.</div><div class="code"><pre><code class="language-php">$number = 1;
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$number = 'one';
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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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</body>
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