php_log.rb

state = :init
n = 0
STDIN.each_line do |line|
  n += 1
  if state == :init
    if line =~ /Creating default object from empty value/
      state = :stack
      next
    end
  elsif state == :stack
    next if line =~ /PHP Stack trace:/
    next if line =~ /PHP\s+\d+\./
    state = :init
    redo
  end
  puts "#{n}: #{line}"
end