Why commands are printed from middle of the page in thermal printer

Question

Why the commands in thermal printer start printing from the middle of the page and why it was cut before the first receipt finished. Following is my code ( I am using https://www.neodynamic.com/articles/How-to-print-raw-ESC-POS-commands-from-PHP-directly-to-the-client-printer/ )

    //Create ESC/POS commands for sample receipt
$esc = '0x1B'; //ESC byte in hex notation
$newLine = '0x0A'; //LF byte in hex notation

$cmds = '';
$cmds = $esc . "@"; //Initializes the printer (ESC @)

$cmds .= $esc . '!' . '0x38'; //Emphasized + Double-height + Double-width mode selected (ESC ! (8 + 16 + 32)) 56 dec => 38 hex
$cmds .= 'ALGERIE TELECOM'; //text to print
$cmds .= $newLine . $newLine;
$cmds .= $esc . '!' . '0x00'; //Character font A selected (ESC ! 0)
$cmds .= 'Serial           1234567890';
$cmds .= $newLine;
$cmds .= 'PIN              12345566778';
$cmds .= $newLine . $newLine;
$cmds .= 'Face Value        129080981283';
$cmds .= $newLine;
$cmds .= 'Voucher Type      Broadband';
$cmds .= $newLine;
$cmds .= 'Mobile            Mobile';
$cmds .= $newLine . $newLine;
$cmds .= $esc . '!' . '0x18'; //Emphasized + Double-height mode selected (ESC ! (16 + 8)) 24 dec => 18 hex
$cmds .= '# ALGERIE TELECOM';
$cmds .= $esc . '!' . '0x00'; //Character font A selected (ESC ! 0)
$cmds .= $newLine . $newLine;
$cmds .= '09/29/22  19:53:17';

$cmds .= $newLine;
$cmds .= '0x1D0x560x00';
$cmds .= $newLine;

$cmds .= $esc . '!' . '0x38'; //Emphasized + Double-height + Double-width mode selected (ESC ! (8 + 16 + 32)) 56 dec => 38 hex
$cmds .= 'ALGERIE TELECOM'; //text to print
$cmds .= $newLine . $newLine;
$cmds .= $esc . '!' . '0x00'; //Character font A selected (ESC ! 0)
$cmds .= 'Serial            0987654321';
$cmds .= $newLine;
$cmds .= 'PIN               28409328385';
$cmds .= $newLine . $newLine;
$cmds .= 'Face Value        129080981283';
$cmds .= $newLine;
$cmds .= 'Voucher Type      Broadband2';
$cmds .= $newLine;
$cmds .= 'Mobile            Mobile2';
$cmds .= $newLine . $newLine;
$cmds .= $esc . '!' . '0x18'; //Emphasized + Double-height mode selected (ESC ! (16 + 8)) 24 dec => 18 hex
$cmds .= '# ALGERIE TELECOM';
$cmds .= $esc . '!' . '0x00'; //Character font A selected (ESC ! 0)
$cmds .= $newLine . $newLine;
$cmds .= '09/29/22  19:53:17

Receipts

Answer 1

This is due to the distance between the print head and paper cutter.

$cmds .= '0x1D0x560x00';

Function A on this page is what you are using in your question article.
GS V

Select cut mode and cut paper

<Function A>           Executes paper cut  
   ASCII   GS  V  m  
   Hex     1D 56  m  
                  m : 0 Full cut  

With this command, the paper is cut at the paper position when the printer receives the command.

---

Function B is the one you should specify.

<Function B>           Feeds paper to [cutting position + (n × vertical motion unit)] and executes paper cut  
   ASCII   GS  V  m  n  
   Hex     1D 56  m  n  
                  m : 65(0x41) Full cut  
                  n : Feeds paper (n × vertical motion unit)  

Adjust the paper feed amount XX so that the paper is cut at the correct position.

$cmds .= '0x1D0x560x410xXX';