php 操作mysql插入数据
1、table_arr【】里保存的是html代码。用来在网页上显示表格。
2、数据库中保存table_arr【】里的代码段的字段用的是text类型。
我的问题在于,多一个保存$table_arr[]内容,如outstanding_thesis_tab,就无法执行插入操作。否则可以。我想知道这问题出在哪里。
$first_step="insert into lw_process(process_stu_num,dic_id,t_stu_select_title,p_stu_select_title,t_ter_select_stu,p_ter_select_stu,t_stu_select_ter,p_stu_select_ter,t_open_title,p_open_title,t_sub_original_ver,p_sub_original_ver,t_mid_check,p_mid_check,t_sub_final_ver,p_sub_final_ver,t_input_score,p_input_score,now_statue,final_statue,author_promise_tab,ter_promise_tab,open_title_tab,mid_check_stu_tab,mid_check_ter_tab,tutor_score_tab,review_score_tab,reply_score_tab,complex_score_tab,reply_record_tab,outstanding_thesis_tab) values(".$_POST['user_num'].",".$_POST['dic_id'].",'".$time_arr['t_stu_select_title']."',0,'".$time_arr['t_ter_select_stu']."',0,'".$time_arr['t_stu_select_ter']."',0,'".$time_arr['t_open_title']."',0,'".$time_arr['t_sub_original_ver']."',0,'".$time_arr['t_mid_check']."',0,'".$time_arr['t_sub_final_ver']."',0,'".$time_arr['t_input_score']."',0,0,0,'".$table_arr['作者承诺保证书']."','".$table_arr['教师承诺保证书']."','".$table_arr['开题报告表']."','".$table_arr['中期检查情况表']."','".$table_arr['中期检查教师检查表']."','".$table_arr['毕业论文(设计)指导教师成绩评定表']."','".$table_arr['评阅教师评定成绩评定表']."','".$table_arr['答辩评分表']."','".$table_arr['综合成绩评定表']."','".$table_arr['答辩记录表']."','".$table_arr['优秀论文推荐表']."')";
$first_step_rec = mysql_query($first_step,$conn);

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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