在PHP中使用preg_replace时如何获得匹配？

int preg_match ( string $pattern , string $subject [, array &$matches [, int $flags = 0 [, int $offset = 0 ]]] )

$subject = "The quick brown fox jumps over the lazy dog.";
$pattern = '/quick (brown) (fox)/';

if (preg_match($pattern, $subject, $matches)) {
    echo "Matches found!";
    echo "Match 1: " . $matches[0] . "\n"; // 输出完整匹配结果
    echo "Match 2: " . $matches[1] . "\n"; // 输出第一个括号匹配结果
    echo "Match 3: " . $matches[2] . "\n"; // 输出第二个括号匹配结果
} else {
    echo "No matches found.";
}

Matches found!
Match 1: quick brown fox
Match 2: brown
Match 3: fox