Example of reading server-side files and displaying them on a web page with PHP

The content of this article will tell you how to use PHP to read the file on the server and display it on the web page.

There is a file named orders.txt stored on the server, its content is as follows:

Now create the vieworder.PHP file, read it out and display it;

<?php 
  $DOCUMENT_ROOT = $_SERVER['DOCUMENT_ROOT']; 
?> 
<!DOCTYPE html> 
<html> 
<head> 
  <meta charset="UTF-8"> 
  <title>Customer Order</title> 
</head> 
<body> 
<h1>Our Store</h1> 
<h2>Customer Order</h2> 
<?php 
  //Open file, (read-only mode+binary mode) 
  @$fp = fopen("$DOCUMENT_ROOT/L02/files/orders.txt 
  flock($fp, LOCK_SH); 
  if (!$fp) { 
    echo "<p><strong>Order did not load, please try again./strong></p>"; 
    exit; 
  } 
  while(!feof($fp)){ 
    $order=fgets($fp,999); 
    echo $order."<br/>"; 
  } 
  //Release the existing lock 
  flock($fp,LOCK_UN); 
  //Close the file stream 
  fclose($fp); 
?> 
</body> 
</html>

The final page presented is:

Supplementary knowledge points of file read and write:

feof() - Know when to finish reading the file;
fgets(), fgetss(), fgetcsv() - Read a line of data at a time;
readfile(), fpassthru(), file(), file_get_contents() - Read the entire file;
fgetc() - Read a character;
fread() - Read any length;
file_exists() - Check if the file exists;
filesize() - Determine file size;
unlink() - Delete a file;
rewind(), fseek(), ftell() - Positioning in the file;
flock() - File locking;

That's all for this article, I hope it will be helpful to everyone's learning, and I also hope everyone will support the Yell Tutorial more.

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