PHP tutorial-php method of reading and outputting other files

ob_start();
iconv('utf-8','gb2312',readfile('1.html')); //Directly output the text content
echo '

---

';

$data = file_get_contents( './1.html',null,null,0,10);
var_dump($data);//Output string
echo '

---

';


$data = file('./1 .html');
var_dump($data);//Output array
echo '

---

';

$stream = fopen('./1.html','r');
echo stream_get_contents($ stream,12);//Output string
echo '

---

';

//fread() reads the file (safe for binary files) The file system pointer is typically created by fopen() resource.
$data = fopen('./1.html','rb');
$contents = fread($data,filesize('./1.html'));
echo $contents;//output string

Summary of the PHP tutorial on how to read and output other files. I hope everyone has to help.