lect04a

Exercise: Let's write a function which takes in the name of a directory, and returns a string mentioning each file in the directory: something like:

"One file is someFile.txt.<br />Another file is someFile2.txt.<br />Another file is Zzzz.php.<br />"

Hint ¹: scandir.

Exercise: Write a function that takes in an array of key/values pairs, and returning a string that happens to be html for a pull-down menu of those values.

test( HTMLPulldown( array( "Jan" => "January", "Dec" => "December" ) ),
      "<select
  <option value='Jan'>January</option>
  <option value='Dec'>December</option>
</select>" );


test( HTMLPulldown( array( "January", "February", "December" ) ),
      "<select
  <option value='0'>January</option>
  <option value='1'>February</option>
  <option value='2'>December</option>
</select>" );

This is pretty cool. However, looking closely at the generated HTML, there is one thing missing: we want our select node to include a name attribute. What do we need to tweak?

Optional: extend the above by including an optional parameter: a top-option like “please select:”.

Left as an exercise: Similar to above, make a function that takes in an array, and returns (the html for) a bunch of checkboxes, inside table.

To think about: array and loop for pluralize
date formats: parsing, internal format, and converting to string
explore the manual page for date; optional args; 'see also'
http://www.php.net/manual/en/datetime.createfromformat.php
a function for print out file (as html)

¹Usually, a google search like “php list files” gives good matches; in this particular case we get sidetracked by related functions that deal with file-handles and are iterators. ↩

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©2011, Ian Barland, Radford University
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