PHP で非バッファー クエリ API を実装する 3 つの方法

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
$uresult = $mysqli->query("SELECT Name FROM City", MYSQLI_USE_RESULT);

if ($uresult) {
  while ($row = $uresult->fetch_assoc()) {
    echo $row[&#39;Name&#39;] . PHP_EOL;
  }
}
$uresult->close();
?>

<?php
$pdo = new PDO("mysql:host=localhost;dbname=world", &#39;my_user&#39;, &#39;my_pass&#39;);
$pdo->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false);

$uresult = $pdo->query("SELECT Name FROM City");
if ($uresult) {
  while ($row = $uresult->fetch(PDO::FETCH_ASSOC)) {
    echo $row[&#39;Name&#39;] . PHP_EOL;
  }
}
?>

<?php
$conn = mysql_connect("localhost", "my_user", "my_pass");
$db  = mysql_select_db("world");

$uresult = mysql_unbuffered_query("SELECT Name FROM City");
if ($uresult) {
  while ($row = mysql_fetch_assoc($uresult)) {
    echo $row[&#39;Name&#39;] . PHP_EOL;
  }
}
?>