Create or write append in text file

Question

I have a website that every time a user logs in or logs out I save it to a text file   My code doesn t work in appending data or creating a text file if it does not exist   Here is the sample code   myfile   fopen  logs txt    wr   or die  Unable to open file      txt    user id date   fwrite  myfile   txt   fclose  myfile     It seems it does not append to next line after I open it again   Also I think it would also have an error in a situation when 2 users login at the same time  would it affect opening the text file and saving it afterwards

User · Answer

There is no such file open mode as  wr  in your code   fopen  logs txt    wr      The file open modes in PHP http   php net manual en function fopen php is the same as in C  http   www cplusplus com reference cstdio fopen    There are the following main open modes  r  for read   w  for write and  a  for append  and you cannot combine them  You can add other modifiers like     for update   b  for binary  The new C standard  adds a new standard subspecifier   x    supported by PHP  that can be appended to any  w  specifier  to form  wx    wbx    w x  or  w bx   wb x    This subspecifier forces the function to fail if the file exists  instead of overwriting it    Besides that  in PHP 5 2 6  the  c  main open mode was added  You cannot combine  c  with  a    r    w   The  c  opens the file for writing only  If the file does not exist  it is created  If it exists  it is neither truncated  as opposed to  w    nor the call to this function fails  as is the case with  x     c       Open the file for reading and writing  otherwise it has the same behavior as  c     Additionally  and in PHP 7 1 2 the  e  option was added that can be combined with other modes  It set close-on-exec flag on the opened file descriptor  Only available in PHP compiled on POSIX 1-2008 conform systems    So  for the task as you have described it  the best file open mode would be  a   It opens the file for writing only  It places the file pointer at the end of the file  If the file does not exist  it attempts to create it  In this mode  fseek   has no effect  writes are always appended    Here is what you need  as has been already pointed out above   fopen  logs txt    a

User · Answer

Try this code   function logErr  data      logPath     DIR         logs logs txt      mode     file exists  logPath      w   a      logfile   fopen  logPath   mode     fwrite  logfile    r n    data     fclose  logfile       I always use it like this  and it works

User · Answer

Although there are many ways to do this  But if you want to do it in an easy way and want to format text before writing it to log file  You can create a helper function for this   if   function exists  logIt          function logIt  logMe                 logFilePath   storage path  logs cron log   date  Y-m-d     log             cronLogFile   fopen  logFilePath   a            fwrite  cronLogFile  date  Y-m-d H i s            logMe  PHP EOL           fclose  cronLogFile

User · Answer

You can do it the OO way  just an alternative and flexible   class Logger        private          file           timestamp       public function   construct  filename             this- gt file    filename             public function setTimestamp  format             this- gt timestamp   date  format     amp raquo                public function putLog  insert            if  isset  this- gt timestamp                 file put contents  this- gt file   this- gt timestamp  insert   lt br gt    FILE APPEND             else               trigger error  Timestamp not set   E USER ERROR                        public function getLog              content    file get contents  this- gt file           return  content             Then use it like this    let s say you have user name stored in a session  semi pseudo code     log   new Logger  log txt     log- gt setTimestamp  D M d  y h i A     if  user logs in         log- gt putLog  Successful Login      SESSION  user name       if  user logs out         log- gt putLog  Logout      SESSION  user name         Check your log with this    log- gt getLog      Result is like   Sun Jul 02  17 05 45 PM    Successful Login  JohnDoe Sun Jul 02  17 05 46 PM    Logout  JohnDoe     github com thielicious Logger

User · Answer

Try something like this      txt    user id date     myfile   file put contents  logs txt    txt PHP EOL   FILE APPEND   LOCK EX

User · Answer

Use the a mode  It stands for append    myfile   fopen  logs txt    a   or die  Unable to open file      txt    user id date   fwrite  myfile    n    txt   fclose  myfile

User · Answer

This is working for me  Writing creating as well  and or appending content in the same mode     fp   fopen  MyFile txt    a

[php] Create or write/append in text file

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