优化12代码 只写php段1 PHP代码中添加新网址部分的判断条件应该是!in_array$newUrl $urls而不是!in_array$newUrl $url。2 PHP代码中删除网址、锁定网址、解锁网址部分的循环变量应该是$selected而不是$_POSTurls。!DOCTYPE htmlhtmlhead title网址收藏夹title meta charset=UTF-8 link

优化后的PHP代码：

<?php
// 读取已保存的网址
$url_file = 'urls.txt';
if (file_exists($url_file)) {
	$urls = file($url_file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
} else {
	$urls = array();
}

// 添加新网址
if (isset($_POST['action']) && $_POST['action'] === 'add' && isset($_POST['url'])) {
	$newUrl = $_POST['url'];
	if (!in_array($newUrl, $urls)) {
		if (filter_var($newUrl, FILTER_VALIDATE_URL)) {
			$urls[] = $newUrl;
			file_put_contents($url_file, implode("\n", $urls));
			echo 'success';
		} else {
			echo 'invalid url';
		}
	} else {
		echo 'url already exists';
	}
}

// 删除网址
if (isset($_POST['action']) && $_POST['action'] === 'delete' && isset($_POST['urls'])) {
	$selected = $_POST['urls'];
	foreach ($selected as $index) {
		if (array_key_exists($index, $urls)) {
			unset($urls[$index]);
		}
	}
	file_put_contents($url_file, implode("\n", $urls));
	echo 'success';
}

// 锁定网址
if (isset($_POST['action']) && $_POST['action'] === 'lock' && isset($_POST['urls'])) {
	$selected = $_POST['urls'];
	foreach ($selected as $index) {
		if (array_key_exists($index, $urls)) {
			$lockedUrl = 'locked:' . $urls[$index];
			if (!in_array($lockedUrl, $urls)) {
				$urls[$index] = $lockedUrl;
			}
		}
	}
	file_put_contents($url_file, implode("\n", $urls));
	echo 'success';
}

// 解锁网址
if (isset($_POST['action']) && $_POST['action'] === 'unlock' && isset($_POST['urls'])) {
	$selected = $_POST['urls'];
	foreach ($selected as $index) {
		if (array_key_exists($index, $urls)) {
			$unlockedUrl = str_replace('locked:', '', $urls[$index]);
			if (!in_array($unlockedUrl, $urls)) {
				$urls[$index] = $unlockedUrl;
			}
		}
	}
	file_put_contents($url_file, implode("\n", $urls));
	echo 'success';
}
?>