PHP中高效提取动态参数视频URL：正则表达式与内置函数的实战指南

http\S*?\.mp4\?[a-zA-Z]+=([0-9]+)&[a-zA-Z]+=([0-9a-z]+)

<?php
$html = "这是一个包含视频链接的示例文本：http://cdn.videourl.mp4?expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0 还有其他内容。";

// 注意正则表达式需要用分隔符包裹，例如 `/.../`
preg_match_all('/http\S*?\.mp4\?[a-zA-Z]+=([0-9]+)&[a-zA-Z]+=([0-9a-z]+)/',
    $html,
    $matches, // 将包含匹配到的数据
    PREG_SET_ORDER // 格式化数据为数组，每个匹配项一个子数组
);

echo "固定参数顺序的匹配结果:\n";
foreach ($matches as $match) {
    echo "完整URL: " . $match[0] . "\n";
    echo "Expire值: " . $match[1] . "\n";
    echo "Token值: " . $match[2] . "\n";
}
/* 预期输出:
固定参数顺序的匹配结果:
完整URL: http://cdn.videourl.mp4?expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0
Expire值: 1635939248
Token值: 7022dbc14de970c7uc040ac4f35058f0
*/
?>

http\S*?\.mp4\?(?:expire=(?P<expire>[0-9]+)&token=(?P<token>[0-9a-z]+)|token=(?P<token>[0-9a-z]+)&expire=(?P<expire>[0-9]+))

<?php
$html_fixed_order = "http://cdn.videourl.mp4?expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0";
$html_reversed_order = "http://cdn.videourl.mp4?token=7022dbc14de970c7uc040ac4f35058f0&expire=1635939248";

$pattern_unfixed_order = '/http\S*?\.mp4\?(?:expire=(?P<expire>[0-9]+)&token=(?P<token>[0-9a-z]+)|token=(?P<token>[0-9a-z]+)&expire=(?P<expire>[0-9]+))/';

preg_match_all($pattern_unfixed_order, $html_fixed_order, $matches_fixed, PREG_SET_ORDER);
echo "参数固定顺序匹配结果 (使用处理不固定顺序的正则):\n";
foreach ($matches_fixed as $match) {
    echo "完整URL: " . $match[0] . "\n";
    // 注意：preg_match_all 使用 PREG_SET_ORDER 时，命名捕获组仍会以数字索引形式出现，
    // 且如果存在多个同名捕获组，只会保留最后一个。
    // 更推荐使用 parse_url/parse_str 获取参数。
    echo "Expire值: " . (isset($match['expire']) ? $match['expire'] : $match[1]) . "\n";
    echo "Token值: " . (isset($match['token']) ? $match['token'] : $match[2]) . "\n";
}

preg_match_all($pattern_unfixed_order, $html_reversed_order, $matches_reversed, PREG_SET_ORDER);
echo "\n参数反转顺序匹配结果 (使用处理不固定顺序的正则):\n";
foreach ($matches_reversed as $match) {
    echo "完整URL: " . $match[0] . "\n";
    echo "Expire值: " . (isset($match['expire']) ? $match['expire'] : $match[2]) . "\n";
    echo "Token值: " . (isset($match['token']) ? $match['token'] : $match[1]) . "\n";
}
?>

<?php
$video_url = "http://cdn.videourl.mp4?expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0";

$url_components = parse_url($video_url);
print_r($url_components);
/* 预期输出:
Array
(
    [scheme] => http
    [host] => cdn.videourl.mp4
    [query] => expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0
)
*/
?>

<?php
$video_url = "http://cdn.videourl.mp4?expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0";
$query_string = parse_url($video_url, PHP_URL_QUERY);
echo "查询字符串: " . $query_string . "\n"; // 输出: expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0
?>

<?php
$video_url = "http://cdn.videourl.mp4?expire=1635939248&token=7022dbc14de970c7uc040ac4f35058f0";

// 1. 使用 parse_url 获取查询字符串
$query_string = parse_url($video_url, PHP_URL_QUERY);

// 2. 使用 parse_str 将查询字符串解析为数组
$params = []; // 初始化一个空数组来存储结果
parse_str($query_string, $params);

echo "使用内置函数解析参数:\n";
var_dump($params);
/* 预期输出:
array(2) {
  ["expire"]=>
  string(10) "1635939248"
  ["token"]=>
  string(32) "7022dbc14de970c7uc040ac4f35058f0"
}
*/

echo "Expire值: " . $params['expire'] . "\n";
echo "Token值: " . $params['token'] . "\n";
?>