import os

#定义程序根目录
rootpath='D:\\wamp\\www\\erp\\app'

def m_replace(path):
 for item in os.listdir(path):
  nowpath=os.path.join(path,item)
  if os.path.isdir(nowpath):
   m_replace(nowpath)
  else:
   if nowpath.find('.php')>0:
    f=open(nowpath,'r+')
    content=f.read().replace('& new ','new ')
    open(nowpath,'w').write(str(content))
    f.close()

if __name__=="__main__":
 m_replace(rootpath)