php遍历子文件
<br /><?php<br /><br />function list_dir($dirpath){ <br /> //判断路径最后一个字符是不是"\"<br /> //如果不是 则在路径后加"\" <br /> if($dirpath[strlen($dirpath)-1]!="\\"){$dirpath.="\\";} <br /> static $result_array=array(); <br /> //判断给定路径是否是一个目录<br /> if(is_dir($dirpath)){ <br /> //打开目录句柄<br /> $handle=opendir($dirpath);<br /> //从目录句柄中读取条目<br /> //读取该目录下的所有文件及文件夹<br /> while($file=readdir($handle)){ <br /> if($file=="."||$file==".."){continue;} <br /> //判断读取出来的是否是一个目录<br /> if(is_dir($dirpath.$file)){ <br /> list_dir($dirpath.$file."\\");<br /> }else{ <br /> //将一个或多个单元压入数组的末尾<br /> array_push($result_array,$dirpath.$file); <br /> } <br /> } <br /> closedir($handle); <br /> } <br /> return $result_array; <br />} <br />$path="D:";<br />$array=list_dir($path); <br />foreach($array as $value){ <br /> echo $value; <br />echo "<br>"; <br />}<br />?><br />]
要是遍历d盘的时候,由于文件太多,会卡在哪里很久
有没有什么优化的方法
------解决思路----------------------
减少遍历的范围是唯一优化的方法
使用 glob 不递归或目录迭代器可使速度提高,但也有限
$p = './';<br />$res = glob("$p/*");<br />for($i=0; $i<count($res); $i++) {<br /> if(is_dir($res[$i]))<br /> foreach(glob("{$res[$i]}/*") as $f) $res[] = $f;<br />}<br />print_r($res);
$path = '.';<br />$ite = new RecursiveIteratorIterator( new RecursiveDirectoryIterator($path) );<br /><br />$deep = 0;<br />foreach ($ite as $cur) {<br /> $fn = $cur->getBasename();<br /> if($fn == '.' <br><font color='#FF8000'>------解决思路----------------------</font><br> $fn == '..') continue;<br /> $res[] = $fn;<br /> if(($d=$ite->getDepth()) == $deep);<br /> echo "$d $fn <br>";<br />}

Absolute session timeout starts at the time of session creation, while an idle session timeout starts at the time of user's no operation. Absolute session timeout is suitable for scenarios where strict control of the session life cycle is required, such as financial applications; idle session timeout is suitable for applications that want users to keep their session active for a long time, such as social media.

The server session failure can be solved through the following steps: 1. Check the server configuration to ensure that the session is set correctly. 2. Verify client cookies, confirm that the browser supports it and send it correctly. 3. Check session storage services, such as Redis, to ensure that they are running normally. 4. Review the application code to ensure the correct session logic. Through these steps, conversation problems can be effectively diagnosed and repaired and user experience can be improved.

session_start()iscrucialinPHPformanagingusersessions.1)Itinitiatesanewsessionifnoneexists,2)resumesanexistingsession,and3)setsasessioncookieforcontinuityacrossrequests,enablingapplicationslikeuserauthenticationandpersonalizedcontent.

Setting the httponly flag is crucial for session cookies because it can effectively prevent XSS attacks and protect user session information. Specifically, 1) the httponly flag prevents JavaScript from accessing cookies, 2) the flag can be set through setcookies and make_response in PHP and Flask, 3) Although it cannot be prevented from all attacks, it should be part of the overall security policy.

PHPsessionssolvetheproblemofmaintainingstateacrossmultipleHTTPrequestsbystoringdataontheserverandassociatingitwithauniquesessionID.1)Theystoredataserver-side,typicallyinfilesordatabases,anduseasessionIDstoredinacookietoretrievedata.2)Sessionsenhances

PHPsessionscanstorestrings,numbers,arrays,andobjects.1.Strings:textdatalikeusernames.2.Numbers:integersorfloatsforcounters.3.Arrays:listslikeshoppingcarts.4.Objects:complexstructuresthatareserialized.

TostartaPHPsession,usesession_start()atthescript'sbeginning.1)Placeitbeforeanyoutputtosetthesessioncookie.2)Usesessionsforuserdatalikeloginstatusorshoppingcarts.3)RegeneratesessionIDstopreventfixationattacks.4)Considerusingadatabaseforsessionstoragei

Session regeneration refers to generating a new session ID and invalidating the old ID when the user performs sensitive operations in case of session fixed attacks. The implementation steps include: 1. Detect sensitive operations, 2. Generate new session ID, 3. Destroy old session ID, 4. Update user-side session information.


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