Outside of the PHP interpreter, create a new
template file in the style of Example 10-2. Use
file_get_contents( ) and
file_put_contents( ) to read an HTML template
file, substitute values for the template variables, and save the new
page to a separate file.
Outside of the PHP interpreter, create a file that contains some
email addresses, one per line. Make sure a few of the addresses
appear more than once in the file. Call that file
addresses.txt. Then, write a PHP program that
reads each line in addresses.txt and counts how
many times each address appears. For each distinct address in
addresses.txt, your program should write a line
to another file, addresses-count.txt. Each line
in addresses-count.txt should consist of the
number of times an address appears in
addresses.txt, a comma, and the email address.
Write the lines to addresses-count.txt in sorted
order from the address that occurs the most times in
addresses.txt to the address that occurs the
fewest times in addresses.txt.
Display a CSV file as an HTML table. If you don't
have a CSV file (or spreadsheet program) handy, use the data from
Write a PHP program that displays a form that asks a user for the
name of a file underneath the web server's document
root directory. If that file exists on the server, is readable, and
is underneath the web server's document root
directory, then display the contents of the file. For example, if the
user enters article.html, display the file
article.html in the document root directory. If
the user enters catalog/show.php, display the file
show.php in the directory
catalog under the document root directory. Table 6-1 tells you how to find the web
server's document root directory.
Modify your solution to the previous exercise so that the program
displays only files whose names end in .html.
Letting users look at the PHP source code of any page on your site
can be dangerous if those pages have sensitive information in them
such as database usernames and passwords.