A paging text-based PHP message board source code _ php instance

A paging text-based PHP message board source code beginner PHP compiled a message board program. I feel good about myself, so I put it up with a thick face. please correct me. The source program is as follows:

       
 N "; echo" alert ("Please enter at least the name and the message title. "); N"; echo "history. back ();"; echo "scriptN "; exit;} $ adddata = $ name. "t ". $ e_mail. "t ". $ url. "t ". $ title. "t ". $ data. "t ". $ icon. "t ". $ time. "n"; if (file_exists ($ guestfile) {$ filebuffer = file ($ guestfile); if (sizeof ($ filebuffer)> 100) {for ($ I = 0; $ I <100; $ I ++) $ newbuffer [I] = $ filebuffer [I];} else {$ newbuffer = $ filebuffer;} $ fp = fopen ($ guestfile, "w"); fputs ($ fp, $ adddata); fclose ($ fp); $ buffer = implode ("", $ newbuffer); $ fp = fopen ($ guestfile, "a"); fputs ($ fp, $ bu Ffer); fclose ($ fp);} else {$ fp = fopen ($ guestfile, "w"); fwrite ($ fp, $ adddata ); fclose ($ fp) ;}}?>
   Message Board      
 N ";} else {echo"N ";}?>
 
 
    
  
  
 
   
 
    
 
Power supply 9901 online space message board
 
 
   
 
   
 
    
"> [Back to homepage]
 
   
 
  
 
 
        
 No message
";}Else {$ filebuffer = file ($ guestfile); $ size = sizeof ($ filebuffer); $ pages = ceil ($ size/20); echo"
Total ". $ size." message no. ". $ page." page/total ". $ pages." page
"; If ($ page> 1) {$ prev = $ page-1; echo" <";}for ($ I = 1; $ I <=$ pages; $ I ++) {echo "". $ I. "";} if ($ page <$ pages) {$ next = $ page + 1; echo ">>";} echo"
 
 
  
  
"; For ($ I = ($ page-1) * 20; $ I <$ page * 20 & $ I <$ size; $ I ++) {$ buffer = explode ("t", $ filebuffer [$ I]); echo"
  
  "; Echo" 
    "; Echo" 
    "; Echo" 
    "; Echo" 
    "; Echo" 
    "; Echo" 
   "; Echo" 
    ";}}?> 
  
 
   
 
    
". $ Buffer [3]."
(". $ Buffer [0].")
"; If ($ buffer [2]! = "0") {echo "homepage";} else {echo "homepage";} echo"
"; If ($ buffer [1]! = "0") {echo "E_Mail";} else {echo "E_Mail";} echo"
". $ Buffer [6]."
 
   
 
    
 
". $ Buffer [4]."
 
   
 
   
 
    
 
 
   
 
 
 
 

  
  
 
   
 
    
 
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