php读取文件内容的三种方式(转)
分享下php读取文件内容的三种方法。
- //**************第一种读取方式*****************************
- header("content-type:text/html;charset=utf-8");
- //文件路径
- $file_path="text.txt";
- //判断是否有这个文件
- if(file_exists($file_path)){
- if($fp=fopen($file_path,"a+")){
- //读取文件
- $conn=fread($fp,filesize($file_path));
- //替换字符串
- $conn=str_replace("\r\n","
",$conn); - echo $conn."
"; - }else{
- echo "文件打不开";
- }
- }else{
- echo "没有这个文件";
- }
- fclose($fp);
- //*******************第二种读取方式***************************
- header("content-type:text/html;charset=utf-8");
- //文件路径
- $file_path="text.txt";
- $conn=file_get_contents($file_path);
- $conn=str_replace("\r\n","
",file_get_contents($file_path)); - echo $conn;
- fclose($fp);
- //******************第三种读取方式,循环读取*****************
- header("content-type:text/html;charset=utf-8");
- //文件路径
- $file_path="text.txt";
- //判断文件是否存在
- if(file_exists($file_path)){
- //判断文件是否能打开
- if($fp=fopen($file_path,"a+")){
- $buffer=1024;
- //边读边判断是否到了文件末尾
- $str="";
- while(!feof($fp)){
- $str.=fread($fp,$buffer);
- }
- }else{
- echo "文件不能打开";
- }
- }else{
- echo "没有这个文件";
- }
- //替换字符
- $str=str_replace("\r\n","
",$str); - echo $str;
- fclose($fp);
- 读取INI配置文件的函数:
- $arr=parse_ini_file("config.ini");
- //返回的是数组
- echo $arr['host']."
"; - echo $arr['username']."
"; - echo $arr['password']."
";

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.

PHP sessions have a significant impact on application performance. Optimization methods include: 1. Use a database to store session data to improve response speed; 2. Reduce the use of session data and only store necessary information; 3. Use a non-blocking session processor to improve concurrency capabilities; 4. Adjust the session expiration time to balance user experience and server burden; 5. Use persistent sessions to reduce the number of data read and write times.

PHPsessionsareserver-side,whilecookiesareclient-side.1)Sessionsstoredataontheserver,aremoresecure,andhandlelargerdata.2)Cookiesstoredataontheclient,arelesssecure,andlimitedinsize.Usesessionsforsensitivedataandcookiesfornon-sensitive,client-sidedata.

PHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.

The security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.

PHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita


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