PHP - Duda con codigo para imprimir ticket

<?php

error_reporting(0);

require('../connections/cn.php');

$folio=$_REQUEST['idfolio'];

$query = "select cantidad,articulo,precio from ventas where folio='$folio'";

$result = mysql_query($query);

$detalles = array();

$i = 0;

while($registro = mysql_fetch_array($result)){

      $detalles[$i] = array();

      $detalles[$i]['cant'] = $registro['cantidad'];

      $detalles[$i]['art'] = $registro['articulo'];

      $detalles[$i]['prc'] = $registro['precio'];

      $i++ ;

}

	/// La variable $imp = Impresora.

	if($imp = printer_open('EPSON TM-T88III Receipt')){

		printer_set_option($imp, PRINTER_MODE, 'RAW');

		printer_start_doc($imp);

		printer_start_page($imp);

 	  $font = printer_create_font("Arial", 25, 10, PRINTER_FW_NORMAL, false, false, false, 0);

		  printer_select_font($imp, $font);

		  printer_draw_text($imp, "Garcia's Chenese Cuisine", 0, 10);

		  printer_draw_text($imp, "Pino Suarez #200 - Col.Obrera", 0, 40);

		  printer_draw_text($imp, "Prop.Amado Garcia Lara - Tel (873)7371045", 0, 60);

		  printer_draw_text($imp, "Nota de Venta No. ".str_pad($folio, 6, "0", STR_PAD_LEFT), 0, 80);

		  printer_draw_text($imp, "------------------------------------------------------------------", 0, 100);

		  printer_draw_text($imp, "Cant", 0, 120);

		  printer_draw_text($imp, "Articulo", 70, 120);

		  printer_draw_text($imp, "Precio", 250, 120);

		  printer_draw_text($imp, "Total", 400, 120);

		  printer_draw_text($imp, "------------------------------------------------------------------", 0, 140);

		  printer_delete_font($font);

		  $cont = 130;

		  foreach($detalles as $detalle) {

				$cont = $cont + 20;

				$fontprd = printer_create_font("Arial", 20, 8, PRINTER_FW_NORMAL, false, false, false, 0);

				printer_select_font($imp, $fontprd);

				printer_draw_text($imp, $detalles[0]['cant'], 3, $cont);

				printer_draw_text($imp, $detalles[0]['art'], 60, $cont);

				printer_select_font($imp, $fontprd);

				$s = strlen(number_format($detalles[2]['prc'], 0, '', '.'));

				$y = 260;

				for ($i = 1; $i < $s + 1; $i++) {

				  $u = $i * -1;

				  printer_draw_text($imp, substr(number_format($detalles[0]['prc'], 0, '', '.'), $u, 1), $y, $cont);

				  $y = $y - 8;

				}

				$s1 = strlen(number_format(($detalles[0]['prc'] * $detalles[0]['cant']), 0, '', '.'));

				$y1 = 340;

				for ($i1 = 1; $i1 < $s1 + 1; $i1++) {

				  $u1 = $i1 * -1;

				  printer_draw_text($imp, substr(number_format(($detalles[0]['prc'] * $detalles[0]['cant']), 0, '', '.'), $u1, 1), $y1, $cont);

				  $y1 = $y1 - 8;

				}

				printer_delete_font($fontprd);

			  }

		printer_end_page($imp);

		printer_end_doc($imp);

		printer_close($imp);

		//echo 'Impresion exitosa.';

		//header("location: ../ventas/index.php");

	}else{

		echo 'No se pudo conectar a la impresora.';

	}

?>