1 <?php
2 $file_path = "test.txt";
3 if(file_exists($file_path)){
4 $fp = fopen($file_path,"r");
5 $str = fread($fp,filesize($file_path));//指定读取大小，这里把整个文件内容读取出来
6 echo $str = str_replace("\r\n","<br />",$str);
7 }

1 <?php
2 $file_path = "test.txt";
3 if(file_exists($file_path)){
4 $str = file_get_contents($file_path);//将整个文件内容读入到一个字符串中
5 $str = str_replace("\r\n","<br />",$str);
6 echo $str;
7 }
8 ?>

 1 <?php
 2 $file_path = "test.txt";
 3 if(file_exists($file_path)){
 4 $fp = fopen($file_path,"r");
 5 $str = "";
 6 $buffer = 1024;//每次读取 1024 字节
 7 while(!feof($fp)){//循环读取，直至读取完整个文件
 8 $str .= fread($fp,$buffer);
 9 } 
10 $str = str_replace("\r\n","<br />",$str);
11 echo $str;
12 }
13 ?>

 1 <?php
 2 $file_path = "test.txt";
 3 if(file_exists($file_path)){
 4 $file_arr = file($file_path);
 5 for($i=0;$i<count($file_arr);$i++){//逐行读取文件内容
 6 echo $file_arr[$i]."<br />";
 7 }
 8 /*
 9 foreach($file_arr as $value){
10 echo $value."<br />";
11 }*/
12 }
13 ?>

 1 <?php
 2 $file_path = "test.txt";
 3 if(file_exists($file_path)){
 4 $fp = fopen($file_path,"r");
 5 $str ="";
 6 while(!feof($fp)){
 7 $str .= fgets($fp);//逐行读取。如果fgets不写length参数，默认是读取1k。
 8 }
 9 $str = str_replace("\r\n","<br />",$str);
10 echo $str;
11 }
12 ?>