Added strings page

assets/templates/_table_of_contents.phtml

@@ -5,13 +5,14 @@
         <li><a href="<?= page_path('basics') ?>">Basics</a></li>
         <li><a href="<?= page_path('variables') ?>">Variables</a></li>
         <li><a href="<?= page_path('arithmetic') ?>">Arithmetic</a></li>
+        <li><a href="<?= page_path('strings') ?>">Strings</a></li>
         <li><a href="<?= page_path('comparisons') ?>">Comparisons</a></li>
         <li><a href="<?= page_path('boolean-logic') ?>">Boolean Logic</a></li>
         <li><a href="<?= page_path('conditionals') ?>">Conditionals</a></li>
         <li><a href="<?= page_path('loops') ?>">Loops</a></li>
         <li><a href="<?= page_path('arrays') ?>">Arrays</a></li>
         <li><a href="<?= page_path('functions') ?>">Functions</a></li>
-        <li><a href="<?= page_path('classes') ?>">Classes: Introduction</a></li>
+        <li><a href="<?= page_path('classes') ?>">Classes</a></li>
         <li><a href="<?= page_path('classes-inheritance') ?>">Classes: Inheritance</a></li>
         <li><a href="<?= page_path('classes-visibility') ?>">Classes: Visibility</a></li>
         <li><a href="<?= page_path('classes-constructor') ?>">Classes: Constructor</a></li>

code/strings.php

@@ -0,0 +1,23 @@
+<?php
+
+// As seen in the first chapter, a string is a group of characters created by
+// surrounding text in single or double quotes.
+$firstname = 'Joey';
+$lastname = "Johnson";
+
+// A double quoted string can interpret special characters starting
+// with a back slash to create formatting. The \n creates a newline
+// between the names and after them.
+echo "Jacob\nJones\n";
+
+// Double quoted strings can also embed variables in the text. This code
+// outputs "Cindy Smith".
+$firstname = 'Cindy';
+echo "$firstname Smith\n";
+
+// Another feature of strings is the ability to combine them together.
+// To combine two strings, use the period character in between them.
+$firstname = 'Jenny';
+$lastname = 'Madison';
+$fullname = $firstname . $lastname;
+echo $fullname;

config.php

@@ -27,12 +27,18 @@ return [
             'title' => 'Arithmetic',
             'subtitle' => 'Doing math like a pro',
             'previous' => 'variables',
+            'next' => 'strings',
+        ]),
+        Page::create('strings', null, 'strings.php', [
+            'title' => 'Strings',
+            'subtitle' => 'Working with text',
+            'previous' => 'arithmetic',
             'next' => 'comparisons',
         ]),
         Page::create('comparisons', null, 'comparisons.php', [
             'title' => 'Comparisons',
             'subtitle' => 'Equality checking',
-            'previous' => 'arithmetic',
+            'previous' => 'strings',
             'next' => 'boolean-logic',
         ]),
         Page::create('boolean-logic', null, 'boolean-logic.php', [