Sample Code 270: How to display math and greek characters using symbol font - Part 3 - unicode characters in plain ANSI text file? |
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Written by kksou
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Tuesday, 19 June 2007 |
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Problem In Part 2, we have input math and greek characters as unicode characters on windows platform.
Suppose for some reason the php-gtk2 script has to be in plain ANSI text file, i.e. text file that does not allow any unicode or UTF-8 characters. (One example of this is the display php-gtk2 script that contains unicode characters on the web. Compare the sample code in Part 1 and Part 2 You will find that you can simply copy and paste the code for Part 1. But you cannot do so for Part 2. The unicode characters will end up as a bunch of garbage characters.)
In this Part 3, I will show you how to convert those math and greek characters (which are originally unicode characters) into urlencoded characters as shown below:
Solution
Below are the steps to convert math/greek characters (which are originally unicode characters) into urlencoded characters:
- First you make an exact copy of the sample code from How to display math and greek characters using symbol font - Part 2 - input unicode characters?
- Enter one more line to convert
$greek_str to urlencoded string:
echo "urlencoded string = ".urlencode($greek_str)."\n";
Your code should now looks like this:
- You will see the urlencoded string in the command window as shown below:
- Now all you need is to copy this urlencoded string into your php-gtk2 script, and use
urldecode to convert the string back into the unicode characters as shown in note 1 below.
- Important Note: Once you have all unicode characters converted to urlencoded characters, you can save the php-gtk2 script as plain ANSI text file. You do not need to save this as UTF-8 file.
Sample Code 1
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| <?php
$window = new GtkWindow();
$window->set_size_request(400, 200);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Display Math and Greek Characters\n".
"using Symbol Truetype Font on windows\n".
"Part 3 - urlencode unicode characters");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 60);
$title->set_justify(Gtk::JUSTIFY_CENTER);
$alignment = new GtkAlignment(0.5, 0, 0, 0);
$alignment->add($title);
$vbox->pack_start($alignment, 0, 0);
$vbox->pack_start(new GtkLabel(), 0, 0);
// display greek characters
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- Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
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Explanation The sample code above is based on How to display math and greek characters using symbol font - Part 2 - input unicode characters?
What's new here:
- As explained above, we use
urldecode to convert the urlencoded characters back to unicode characters.
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