<code><?php $url = "http://nsv.ckcdn.com/images/logo1.png"; $refer = "http://nsv.ckcdn.com/"; $opt=array("http"=>array("header"=>"Referer: " . $refer)); $context=stream_context_create($opt); $file_contents = file_get_contents($url,false, $context); echo $file_contents; ?> </code>
我想偽造Referer,然後用 file_get_contents 取得圖片顯示出來,不過顯示出來的是亂碼,該如何解決?
回复内容:
<code><?php $url = "http://nsv.ckcdn.com/images/logo1.png"; $refer = "http://nsv.ckcdn.com/"; $opt=array("http"=>array("header"=>"Referer: " . $refer)); $context=stream_context_create($opt); $file_contents = file_get_contents($url,false, $context); echo $file_contents; ?> </code>
我想偽造Referer,然後用 file_get_contents 取得圖片顯示出來,不過顯示出來的是亂碼,該如何解決?
<code><?php header("Content-type: image/png"); $url = 'http://misc.360buyimg.com/lib/img/e/logo-201305.png'; $file_contents = file_get_contents($url); echo $file_contents; ?> </code>
结果可以正常输出 某东 的LOGO(因为题主提供的图片链接访问不到,所以找了同为PNG格式的LOGO)。
我觉得问题出在file_get_contents
上。文档:http://cn2.php.net/file_get_contents
因为file_get_contents
的作用是整个文件读入一个字符串中,输出是当然是以字符串输出,浏览器不知道它是图片,所以要在加上header("Content-type: image/png")
,以告诉浏览器这是png格式的图片,浏览器才会显示成图片。

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

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Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


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