PHP如何从序列化字符串中提取HTTP格式的URL

首先，你给出的是一段PHP格式的序列化数组字符串：

string(244) "a:3:{s:3:"url";s:81:"http://rsl.local/wp-content/uploads/wp-user-manager-uploads/2018/03/time-icon.png";s:4:"path";s:101:"/Users/aaronsummers/Sites/rsl-awards/wp-content/uploads/wp-user-manager-uploads/2018/03/time-icon.png";s:4:"size";i:1342;}"

从这段字符串里，我们可以直接定位到url键对应的不带引号的目标内容：
http://rsl.local/wp-content/uploads/wp-user-manager-uploads/2018/03/time-icon.png

如果需要用PHP代码自动提取的话，也可以通过反序列化来获取：

// 去掉外层的string(244) 包裹，保留序列化数组部分
$serializedData = 'a:3:{s:3:"url";s:81:"http://rsl.local/wp-content/uploads/wp-user-manager-uploads/2018/03/time-icon.png";s:4:"path";s:101:"/Users/aaronsummers/Sites/rsl-awards/wp-content/uploads/wp-user-manager-uploads/2018/03/time-icon.png";s:4:"size";i:1342;}';
$parsedArray = unserialize($serializedData);
$extractedUrl = $parsedArray['url'];

// 输出提取后的URL
echo $extractedUrl;

内容的提问来源于stack exchange，提问作者Aaron