PHP Simple Message Board

/* *  file locking mechanism  * flock () lightweight consultation file lock  * lock_sh get a shared lock (read program).   * LOCK_EX  obtains an exclusive lock (written program.   * LOCK_UN  release Lock (whether shared or exclusive).   *  If you do not want  flock ()   to block when locked, it is &NBSP;LOCK_NB (not supported on windows ).   *   */ /*  *  Message Board   */     $filename  =  "Message.txt";     if (Isset ($_post[' dosubmit ')) {     Separation of     //Fields | |    Delimited [n]         $mess  =  "{$_post[' username ']}| |". Time (). "| | {$_post[' title ']}| | {$_post[' content '} [n] ";         writemessage ($filename,  $mess);     }    if (File_exists ($filename)) {         Readmessage ($filename);     }    //reading Information     function  readMessage ($filename) {          //        $mess  = file_get_contents ($filename);                  $mess  =  "";                  $fp  = fopen ($filename,  "R");                 flock ($FP,  LOCK _SH+LOCK_NB);//Read lock                  while (!feof ($fp)) {                      $mess  .=fread ($fp,  1024);                 }              &nBsp;  flock ($fp, &NBSP;LOCK_UN+LOCK_NB);//Release lock                   $mess  = rtrim ($mess, "[n]");                  $arrmess  = explode ("[n]",  $ Mess);                 foreach ( $arrmess  as  $m) {                     list ($username, $daytime, $title, $content)  = explode ("| |",  $m );                     echo  "<b>{$username}</b>,". Date (' Y-m-d h:i:s ', $daytime). ", <i>{$title} </i><br/><u>{$content}</u><br/><br/><br/> ";                 }                 fclose ($fp);     }    //Write a message     function writemessage ($filename, $mess) {          $FP  = fopen ($filename,  "a")        //lock file          if (Flock ($FP, &NBSP;LOCK_EX+LOCK_NB)) {             fwrite ($fp,  $mess);             flock ($fp, LOCK_UN+LOCK_NB);//Release file         }else {            echo  ' Write lock failed! ';         }        fclose ($FP);     }?><form action= "index.php"  method= "POST" > User name: <input type= "text"  name= "username"   Value= ""/><br/> title: <input type= "Text"  name= "title"  value= "/><br/> content:< Textarea name= "Content"  cols= " rows=" 4 "></textarea><br/><input type=" Submit " name=" Dosubmit " value=" message "/></form>

This article is from the "Jin Sha Harbor" blog, please be sure to keep this source http://11410485.blog.51cto.com/11400485/1841513

PHP Simple Message Board