/** * 邹颢 * zouhao619@gmail.com *//** * 获取当前毫秒 * @return string */function get_millisecond() { $t = explode ( " ", microtime () ); $t = $t [1] . ($t [0] * 1000); $t2 = explode ( ".", $t ); return $t2 [0];}/** * curl模拟http/https post请求 * @param string $url 请求网址 * @param array $data 请求参数 * @return string 网址内容 */function curl_post($url,$data=array()){ $ch = curl_init($url); curl_setopt($ch, CURLOPT_RETURNTRANSFER,true) ; // 获取数据返回 curl_setopt($ch, CURLOPT_POST,true) ; // 启用时会发送一个常规的POST请求,类型为:application/x-www-form-urlencoded,就像表单提交的一样。 curl_setopt($ch, CURLOPT_POSTFIELDS,$data); // 在HTTP中的“POST”操作。如果要传送一个文件,需要一个@开头的文件名 if(substr($url,0,5)=='https'){ curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); } $content=curl_exec($ch); curl_close($ch) ; return $content;}/** * curl模拟http get请求 * @param string $url 请求网址 * @param string|array $data 请求参数 * @return string 网址内容 */function curl_get($url,$data=array()){ $url=rtrim($url,'/'); if(!empty($data)){ if(is_array($data)){ $first=true; foreach($data as $k=>$v){ if($first){ $url.='?'; $first=false; }else{ $url.='&'; } $url.="{$k}={$v}"; } }else{ $data=ltrim('?',$data); $url.='?'.$data; } } $ch = curl_init($url); curl_setopt($ch,CURLOPT_HEADER,false); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true) ; // 获取数据返回 if(substr($url,0,5)=='https'){ curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); } $content = curl_exec($ch); curl_close($ch); return $content;}/** * 二维数组按键值排序 * @param array $arr 二维数组 * @param string $keys 键值 * @param string $type 升序:asc,降序:desc(else) * @return array */function array_sort($arr,$keys,$type='asc'){ $keysvalue = $new_array = array(); foreach ($arr as $k=>$v){ $keysvalue[$k] = $v[$keys]; } if($type == 'asc'){ asort($keysvalue); }else{ arsort($keysvalue); } reset($keysvalue); foreach ($keysvalue as $k=>$v){ $new_array[$k] = $arr[$k]; } return $new_array;}/** * 获取客户端ip * @param number $type * @return string */function get_client_ip($type = 0) { $type = $type ? 1 : 0; static $ip = NULL; if ($ip !== NULL) return $ip[$type]; if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']); $pos = array_search('unknown',$arr); if(false !== $pos) unset($arr[$pos]); $ip = trim($arr[0]); }elseif (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip = $_SERVER['HTTP_CLIENT_IP']; }elseif (isset($_SERVER['REMOTE_ADDR'])) { $ip = $_SERVER['REMOTE_ADDR']; } // IP地址合法验证 $long = sprintf("%u",ip2long($ip)); $ip = $long ? array($ip, $long) : array('0.0.0.0', 0); return $ip[$type];}/** * 将字符串转换为驼峰式命名 * * @param string $str * @param boolean $big * true大驼峰式 false小驼峰式 * @return string */function hump_type($str, $big = false) { $str = strtolower ( $str ); $big and ucfirst ( $str ); $str = preg_replace ( "/_([a-zA-Z])/e", "strtoupper('\\1')", $str ); return $str;}/** * 遍历删除文件夹 * * @param string $path * 文件夹地址 * @return boolean */function delete_files($path) { if (is_file ( $path )) { return unlink ( $path ); } if (is_dir ( $path )) { $handle = opendir ( $path ); if ($handle != false) { while ( false !== ($file = readdir ( $handle )) ) { if (in_array ( $file, array ( '.', '..' ) )) continue; $file = $path . '/' . $file; if (is_dir ( $file )) { delete_files ( $file ); } else if (is_file ( $file )) { if (unlink ( $file ) == false) return false; } } closedir ( $handle ); } return true; }}/** * 截取字符串(可截取utf8的) * * @param string $str * @param int $start * @param int $length * @param string $trim * @param string $charset * @return string */function sub($str, $start, $length, $trim = "...", $charset = 'UTF-8') { $length+=2; if (function_exists ( 'mb_get_info' )) { $iLength = mb_strlen ( $str, $charset ); $str = mb_substr ( $str, $start, $length, $charset ); if($length\n(\s+)/m', '] => ', $output ); $output = '<pre class="brush:php;toolbar:false">' . htmlspecialchars ( $output, ENT_QUOTES ) . ''; } echo ($output);}/** * 从左边查询子串,找到则删除子串,只删除一次 * * @param string $str * @param string $find * @return string */function substr_left_once($str, $find) { $start = strpos ( $str, $find ); if (is_bool ( $start )) { return $str; } else { return substr ( $str, $start + strlen ( $find ), strlen ( $str ) ); }}/** * 从右边查询子串,找到则删除子串,只删除一次 * * @param string $str * @param string $find * @return string */function substr_right_once($str, $find) { $end = strrpos ( $str, $find ); if (is_bool ( $end )) { return $str; } else { return substr ( $str, 0, $end ); }}

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.

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

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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