felayman-php_读取文件内容的三种步骤

<?php/** * Created by PhpStorm. * User: FelayMan * Date: 14-4-7 * Time: 下午6:14 */    header("content-type:text/html;charset=utf-8");    //第一种方式获取文件内容   function getallcontent1($filename){       //file — 把整个文件读入一个数组中       $content = file_get_contents($filename);       return $content;   }    //第二种方式获取文件内容    function getallcontent2($filename){        $arr = file($filename);        $content='';        foreach($arr as $value){            $content.=$value;        }        $content.=iconv("gbk","utf-8",$content);        return $content;    }    //第三种方式获取文件内容    function getallcontent3($filename){        readfile($filename);    }   //$content =  getallcontent1("index.txt");   //$content =  getallcontent2("index.txt");   // echo $content;    getallcontent3("index.txt");?>