Step 0:
Get Homebrew installed on your mac if you don't already have it
Step 1:
Install highlight. "brew install highlight". (This brings down Lua and Boost as well)
Step 2:
Highlight your source. "highlight -O rtf myfile.php | pbcopy". This will highlight the source code in RTF format and copy the result of that operation to your Mac's clipboard.
Step 3:
Paste into your slide in Keynote. Keynote will create a new text box with your highlighted code. You can adjust the width as needed, and adjust the font size with cmd+ and cmd-
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Perfect - thanks! (Google indexed within 6 hours too). fyi I had to 'brew update' to avoid boost SHA mismatch error.