replace_first_line.py

import os, fnmatch
def findReplace(directory, filePattern):
    for path, dirs, files in os.walk(os.path.abspath(directory)):
        for filename in fnmatch.filter(files, filePattern):
            filepath = os.path.join(path, filename)
            with open(filepath) as f:
                s = f.read().splitlines(True)
            with open(filepath, "w") as f:
				f.write("<?php")
				f.writelines(s[1:])
				
# findReplace("directory", "*file extension")
            
findReplace("/var/www/project_20", "*.php")