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<?php
// 检测 $url 是否包含查询字符串
$url = "http://www.w3cschool.cn";
if (!filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_QUERY_REQUIRED) === false) {
    echo("$url 是一个合法的 URL");
} else {
    echo("$url 不是一个合法的 URL");
}
?>
 
 
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