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91 lines
4.3 KiB
HTML
91 lines
4.3 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>Boolean Logic</title>
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<meta name="description" content="">
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<link rel="stylesheet" href="/css/site.css">
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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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<button class="menu-button" title="Open Menu">
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</div>
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<div class="container center">
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<h1>Boolean Logic</h1>
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<h3 class="subtitle">Is it a yes or a no?</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">Boolean logic is used to combine booleans to return another boolean.</div><div class="code"><pre><code class="language-php">
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</code></pre></div><div class="doc">Using double ampersands tells PHP to check if both values are true. If so, it will return true. If not, it will return false.</div><div class="code"><pre><code class="language-php">$a = true;
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$b = true;
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$c = false;
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</code></pre></div><div class="doc">Returns true.</div><div class="code"><pre><code class="language-php">$a && $b;
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</code></pre></div><div class="doc">Returns false.</div><div class="code"><pre><code class="language-php">$a && $c;
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</code></pre></div><div class="doc">Using two pipe characters checks if either value is true. Then, it will return true. If both values are false, the PHP returns false.</div><div class="code"><pre><code class="language-php">$a = true;
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$b = false;
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$c = false;
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$d = true;
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</code></pre></div><div class="doc">Returns true.</div><div class="code"><pre><code class="language-php">$a || $b;
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</code></pre></div><div class="doc">Returns false.</div><div class="code"><pre><code class="language-php">$b || $c;
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</code></pre></div><div class="doc">Returns true.</div><div class="code"><pre><code class="language-php">$a || $d;
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</code></pre></div><div class="doc">Using an exclamation point returns the value flipped.</div><div class="code"><pre><code class="language-php">$d = true;
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</code></pre></div><div class="doc">Outputs false.</div><div class="code"><pre><code class="language-php">echo !$d;
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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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</body>
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