We had an interesting question, can we calculate how many lines of code we have written for an entire project? It turns out this isnt the easiest thing to calculate for a web-project, but we gave it a go. This is the best we have come up with so far for all code we have written to calculate the number of lines of code in all PHP, CSS, JS, HTML and HTM pages.
( find ./ -name '*.php' -print0 -o -name '*.css' -print0 -o -name '*.js' -print0 -o -name '*.html' -print0 -o -name '*.htm' -print0 | xargs -0 cat ) | wc -l
The answer for our particular project was 1500784 lines of code!
If you wanted to do just PHP pages its rather easier:
( find ./ -name '*.php' -print0 | xargs -0 cat ) | wc -l