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868 B
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.)
<?php
echo "Hello World!\n";
There is a lot going on in the above code 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";