php server function

1echo $_SERVER['PHP_SELF'];
2echo "<br>";
3echo $_SERVER['SERVER_NAME'];
4echo "<br>";
5echo $_SERVER['HTTP_HOST'];
6echo "<br>";
7// echo $_SERVER['HTTP_REFERER'];
8echo "<br>";
9echo $_SERVER['HTTP_USER_AGENT'];
10echo "<br>";
11echo $_SERVER['SCRIPT_NAME'];

1<?php
2  // PHP $_SERVER['...']; method
3  
4  // PHP file name
5  echo 'PHP file name: '.$_SERVER['PHP_SELF'].'<br>';
6  // Server name
7  echo 'Server name: '.$_SERVER['SERVER_NAME'].'<br>';
8  // HTTP host
9  echo 'HTTP host: '.$_SERVER['HTTP_HOST'].'<br>';
10  // Refering link
11  echo 'Refering link: '.$_SERVER['HTTP_REFERER'].'<br>';
12  // User agent
13  echo 'User agent: '.$_SERVER['HTTP_USER_AGENT'].'<br>';
14  // Script name
15  echo 'Script name: '.$_SERVER['SCRIPT_NAME'];
16  
17  // The rest is optional
18
19  if($_SERVER['PHP_SELF']=='/filename.php'){
20    //If there is no folder
21    echo 'No folder'.$_SERVER['PHP_SELF'];
22  } else{
23    // Echo the name of the folder containing the PHP file
24    echo 'PHP file name: '.$_SERVER['PHP_SELF'];
25  }
26  
27  // The same if statements can be used for the script name
28  
29  if($_SERVER['SCRIPT_NAME']=='/filename.php'){
30    // If there is no folder
31    echo 'No folder'.$_SERVER['SCRIPT_NAME'];
32  } else{
33    // Echo the name of the folder containing the PHP file
34    echo 'PHP file name: '.$_SERVER['SCRIPT_NAME'];
35  }
36  
37  echo '<a href="repl.it/@CoolWebDev">More from me...</a>';
38  
39  // I hope you found this helpful! 
40?>