从php中的字符串中删除单词

$str = "This is a sample string";
$words = explode(" ", $str);

$words = array_filter($words, function($word) {
    $wordsToDelete = array("is", "a"); // 需要删除的单词列表
    return !in_array($word, $wordsToDelete);
});

$newStr = implode(" ", $words);

$str = "This is a sample string";
$words = explode(" ", $str);

$words = array_filter($words, function($word) {
    $wordsToDelete = array("is", "a"); // 需要删除的单词列表
    return !in_array($word, $wordsToDelete);
});

$newStr = implode(" ", $words);
echo $newStr;