MCVE for MySQL match fulltext boolean @distance query

<?php

$dbd = [
    'host' => 'localhost',
    'db' => 'test_dbs',
    'user' => '****',
    'pass' => '****',
    'charset' => 'utf8mb4',
    'attrs' => [
        PDO::ATTR_ERRMODE               => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE    => PDO::FETCH_OBJ,
        PDO::MYSQL_ATTR_FOUND_ROWS      => true,
        PDO::ATTR_EMULATE_PREPARES      => true,
    ]
];

$pdo = new PDO(
    "mysql:host={$dbd['host']};dbname={$dbd['db']};charset={$dbd['charset']}",
    $dbd['user'],
    $dbd['pass'],
    $dbd['attrs']
);

$search = ['"tiger mouse" @4'];
$stmt = 'select sText FROM fts_test WHERE MATCH (sText) AGAINST (? IN BOOLEAN MODE)';


$stmt = $pdo->prepare($stmt);
$stmt->execute($search);
$result = $stmt->fetchAll();

print_r($result);

/* ==== Schema SQL ====

CREATE TABLE fts_test (
  sText text,
  FULLTEXT INDEX (sText)
);

INSERT INTO test(sText) VALUES
  ('tiger mouse'),
  ('tiger foo bar mouse'),
  ('tiger foo bar baz mouse');

*/