PHP Basics
PHP code can sit in its own text file, or it can be integrated into the HTML of a web page. The characters <?php mark the beginning of PHP code, and the characters ?> mark the end of the code. Names of files containing PHP code generally have the extension .php rather than .html.
Figure 16-4 shows the "Hello, world!" program, which tradition dictates should be your first program in any language.
Figure 16-4. A basic PHP program
If you copy the contents of Figure 16-4 into a file, name it something ending in .php, and put the file into a directory accessible by a webserver that understands PHP, you'll see something like Figure 16-5.
Note
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