Wrong rendering in Zend Framework

I'm using Zend Framework 1.11.4 , when i preview each URL of my site, returnd HTML has some character that i dont know their 开发者_高级运维source!!

This characters is in the top of returnd HTML(before doctype) and this cause to wrong rendering in Ineternet Explorer(because it prevents to know ie to the correct Doctype). have you any suggestion?

It's (well, may be) UTF8's BOM. Good editors can turn them off. You're either using a bad one or a good one inpropperly configured :)

My first though would be to copy the offending characters to the clipboard and then search through your source code, using grep for example, for these characters. Chances are there is a random string in your view somewhere. This would be the first thing to rule out.

i can only think of you probably having empty lines or other garbage in your source files, you shoudn't close your php tags,

First of all, PHP doesn’t require it, so you even save a few bits on your total filesize. But the most important reason is that it prevents additional whitespace that could really mess up your website or application.

you can search around round google for a better explanation of why