Clearing content of text file using php

Question

I have a filelist txt file and I created a file called clear php to clear the content of filelist   I put a button in index html to call clear php to clear the file   Can anyone help me out regarding what PHP code I should write in clear php   How to code a button to call clear php and then return back to index html showing the result that it has been cleared

User · Answer

Try fopen   http   www php net manual en function fopen php  w as mode will truncate the file

User · Answer

create a file handler by opening the file  myTextFileHandler    fopen  filelist txt   r        truncate the file to zero   or you could have used the write method and written nothing to it  ftruncate  myTextFileHandler  0      use location header to go back to index html header  Location index html      I don t exactly know where u want to show the result

User · Answer

This would truncate the file    fh   fopen   filelist txt    w     fclose  fh     In clear php  redirect to the caller page by making use of   SERVER  HTTP REFERER   value

User · Answer

To add button you may use either jQuery libraries or simple Javascript script as shown below   HTML link or button    lt a href     onClick  goclear    id  button  gt click event lt  a gt    Javascript    lt script type  text javascript  gt  var btn   document getElementById  button    function goclear      alert  Handler called  Page will redirect to clear php    document location href    clear php       lt  script gt    Use PHP to clear a file content  For instance you can use the fseek  fp  0   or ftruncate   resource  file   int  size   as below    lt  php   open file to write  fp   fopen   tmp file txt    r        clear content to 0 bits ftruncate  fp  0     close file fclose  fp     gt    Redirect PHP - you can use header   string  string    bool  replace   true    int  http response code        lt  php header  Location  getbacktoindex html      gt    I hope it s help

User · Answer

file put contents  filelist txt         You can redirect by using the header   function to modify the Location header

User · Answer

Use  w  and not   a    if    handle   fopen  file   w

User · Answer

fp   fopen   address   w      if   fp      echo  not Open             -----------------------------------  while  feof  fp                  fputs  fp     999                                 fclose  fp

[php] Clearing content of text file using php

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