从pregmatch_all到csv的阵列

preg_match_all(pattern, subject, matches)

$html = '<a href="https://www.example.com">Example</a><a href="https://www.google.com">Google</a>';
preg_match_all('/<a href="(.*?)">(.*?)<\/a>/', $html, $matches);

Array
(
    [0] => Array
        (
            [0] => <a href="https://www.example.com">Example</a>
            [1] => <a href="https://www.google.com">Google</a>
        )

    [1] => Array
        (
            [0] => https://www.example.com
            [1] => https://www.google.com
        )

    [2] => Array
        (
            [0] => Example
            [1] => Google
        )
)

$csvArray = array();
foreach ($matches[0] as $index => $match) {
    $csvArray[] = array(
        $matches[1][$index],
        $matches[2][$index]
    );
}

Array
(
    [0] => Array
        (
            [0] => https://www.example.com
            [1] => Example
        )

    [1] => Array
        (
            [0] => https://www.google.com
            [1] => Google
        )
)

$fp = fopen('output.csv', 'w');
foreach ($csvArray as $row) {
    fputcsv($fp, $row);
}
fclose($fp);