<?php
$array = [
[1, 'Chad'],
[4, 'Ned'],
[5, 'Dave'],
[14, 'Newt'],
[18, 'Bill'],
[21, 'Norton'],
[25, 'Alan'],
];
$sql = sprintf(
'INSERT INTO test (id, name) VALUES (%s)',
implode('),(', array_fill(0, count($array), '?,?'))
);
$mysqli->execute_query($sql, array_merge(...$array));
var_export(
$mysqli->query('SELECT * FROM test')->fetch_all(MYSQLI_ASSOC)
);