Php获取字符串中的特定单词

$string = "This is a sample string";
$pattern = "/\b(sample)\b/i"; // 匹配单词"sample"，不区分大小写

if (preg_match($pattern, $string, $matches)) {
    echo "匹配到的单词是：" . $matches[0];
} else {
    echo "未找到匹配的单词";
}

$string = "This is a sample string";
$words = explode(" ", $string); // 将字符串按空格分割成数组

foreach ($words as $word) {
    if ($word == "sample") {
        echo "找到匹配的单词：" . $word;
        break;
    }
}