php - mysql_fetch_array 仅获取第一个结果，即使使用 while 循环

Question

我正在尝试使用mysql_fetch_array和while循环来打印多个mysql行，但它只打印第一个结果，而我的表包含许多具有正确条件的结果

$queryString="SELECT * FROM items WHERE order_id='".$order_id."' and confirm_order='0' ORDER BY id";
$myquery=mysql_query($queryString);

$handle = printer_open("POS");
printer_start_doc($handle, "My Document");
printer_start_page($handle);
$font = printer_create_font("Arial", 35, 20, 300, false, false, false, 0);
printer_select_font($handle, $font);

while ($fetch = mysql_fetch_array($myquery)) {

    $product=$fetch[product_name];
    $type=$fetch[type];
    $q=$fetch[item_quantity];
    $comment=$fetch[comment];

    $tex="".$q." ".$type." ".$comment." ".$product."";
    printer_draw_text($handle, $tex, 10, 10);
  }
printer_delete_font($font);
printer_end_page($handle);
printer_end_doc($handle);
printer_close($handle);

注意:-并且我不能使用mysqli或PDO，因为我只是在测试一些东西在一个旧项目上

Answer 1

基于printer_draw_text Manual

The function draws text at position x, y using the selected font.

在您的代码中，x,y 值为 10,10。所以每次新的文字都写在同一个位置上。这意味着前一个被新的覆盖，因此只绘制单个值。

有两种可能的解决方案:-

1.每次迭代后更改 x,y 位置值。

$counter = 10; //add a number counter

while ($fetch = mysql_fetch_assoc($myquery)) {//use assoc for lighter array iteration

    $product=$fetch['product_name']; //use quotes around indexes, best practise
    $type=$fetch['type'];
    $q=$fetch['item_quantity'];
    $comment=$fetch['comment'];

    $tex="$q $type $comment $product";//remove unncessary quotes
    printer_draw_text($handle, $tex, $counter, $counter); // use that number counter as x,y position
    $counter+10;//in each iteration chnage the value by adding 10
}

2.或者在每次迭代中创建新页面:-

while ($fetch = mysql_fetch_assoc($myquery)) {//use assoc for lighter array iteration

    $product=$fetch['product_name'];//use quotes around indexes, best practise
    $type=$fetch['type'];
    $q=$fetch['item_quantity'];
    $comment=$fetch['comment'];

    $tex="$q $type $comment $product";//remove unncessary quotes
    printer_draw_text($handle, $tex, 10, 10);
    printer_end_page($handle); //end page on each iteration
  }
printer_delete_font($font);
printer_end_doc($handle);
printer_close($handle);

注意:- 按原样添加其余代码。