Initial commit for public repo

code/basics.php

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+<?php
+
+// In the tradition of our ancestors, let's start with a hello world program.
+// All PHP files must start with a <?php tag unless it is for a html template.
+// (We will learn about html templates later.)
+echo "Hello World!\n";
+
+// There is a lot going on in this statement so let's work through it.
+
+// First, the echo keyword tells PHP to output some text.
+echo 'I am some text';
+
+// Second, PHP stores text in strings.
+
+// To write a string, you surround letters with single or double quotes.
+// The difference between single quoted strings and double quoted strings
+// is that double quoted strings can hold special characters like \n which tells PHP to start a new line.
+'I am a string';
+"\nI am a string on a new line";
+
+// Third, all lines of code in PHP must end in a semi-colon.
+echo "No semi-colon is a no-no\n";
+
+// Using semi-colons means we can write multiple statements on one line.
+echo 'Hello'; echo " World\n";