$string = preg_replace('/\\b(https?|ftp|file):\\/\\/[-A-Z0-9+&@#\\/%?=~_|$!:,.;]*[A-Z0-9+&@#\\/%=~_|$]/i', '', $string);//该片段来自于http://www.codesnippet.cn/detail/130520133298.html
来源: http://www.codesnippet.cn/detail/130520133298.html