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92 lines
4.8 KiB
HTML
92 lines
4.8 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>Comparisons</title>
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<div class="container center">
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<h1>Comparisons</h1>
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<h3 class="subtitle">Equality checking</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">A boolean is a value that is always 0 or 1, yes or no, on or off. In PHP, a boolean is represented by the words true and false. While programming, you will often want to know if something is true or false.</div><div class="code"><pre><code class="language-php">$a = true;
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$b = false;
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</code></pre></div><div class="doc">There are many constructs and functions that will return a boolean. To start, let's look at comparisons.</div><div class="code"><pre><code class="language-php">$one = 1;
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$two = 2;
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</code></pre></div><div class="doc">Double equals checks if two values are equal. This statement will return false.</div><div class="code"><pre><code class="language-php">$one == $two;
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</code></pre></div><div class="doc">An exclamation point and equal sign check if two values are not equal. This statement will return true.</div><div class="code"><pre><code class="language-php">$one != $two;
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</code></pre></div><div class="doc">You can use greater than and less than symbols to check for comparisons too. This statement will return false.</div><div class="code"><pre><code class="language-php">$one > $two;
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</code></pre></div><div class="doc">This statement will return true.</div><div class="code"><pre><code class="language-php">$one < $two;
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</code></pre></div><div class="doc">If you combine a greater than or less than symbol with an equal, it will check if the value is greater or less than or equal to another value.</div><div class="code"><pre><code class="language-php">$one <= $two;
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$one >= $two;
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</code></pre></div><div class="doc">You can also check that two values are equal and of the same type by using three equal signs.</div><div class="code"><pre><code class="language-php">
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</code></pre></div><div class="doc">This returns true.</div><div class="code"><pre><code class="language-php">1 == '1';
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</code></pre></div><div class="doc">This returns false.</div><div class="code"><pre><code class="language-php">1 === '1';
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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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