1. Field 1
2. You can use print NR or alternatively pipe the output to wc -l

We must use -l otherwise, it will count words instead.

$ awk '{print $1}' access.log | sort | uniq -c

$ awk '{print $7}' access.log | grep 'php' | sort | uniq -c | sort -nr | head -n 1 

You should use head -n 1 to get the one page only.