Get Homebrew installed on your mac if you don't already have it
Install highlight. "brew install highlight". (This brings down Lua and Boost as well)
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.
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-
Notes:
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To get the available styles do
find /usr/local/Cellar -name "*.theme" -type f
highlight --syntax=java -O rtf tmp.java --style vampire | pbcopy
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pbpaste | highlight --syntax=java -O rtf --style moria | pbcopy
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highlight -O rtf /tmp/test.java --line-numbers --font-size 24 --font Inconsolata --style solarized-light -W -j 3 --src-lang java | pbcopy