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phpapprentice/code/basics.php
2018-09-05 20:58:01 -05:00

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PHP

<?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\n";
// Second, PHP stores text in strings.
// To write a string, you surround letters with single or double quotes.
// Double quoted strings can hold special characters like \n which tells PHP to start a new line.
"\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";