Text Data paging in php (Message book paging)

Many pages are introduced in mysq, but few pages are introduced in the format of text data tables. Here I will briefly refer to pages.

This article mainly introduces the following paging ideas:
1. Paging of the message book
2. Flip pages of text forums

------------------------
Page flip of the message book:
------------------------------
This is the simplest page flip in a text data table.

Golbal file
Data. dat --- NOTE FILE USE
User. dat --- Forum File use
Data. dat
_______________________________________________________________________
[1] [POSTUSER] [TITLE] [MEM] [POSTTIME] [IP]
[2] [POSTUSER] [TITLE] [MEM] [POSTTIME] [IP]
[3] [POSTUSER] [TITLE] [MEM] [POSTTIME] [IP]
[4] [POSTUSER] [TITLE] [MEM] [POSTTIME] [IP]
[5] [POSTUSER] [TITLE] [MEM] [POSTTIME] [IP]

Note:
[1, 2, 3, 4, 5...] is added by myself for better understanding.

Index. php source :.

__________________________________________________

--- === BOF ==== ---
<?
$ File = "data. dat"; // data file
If (file_exits ($ file) {// fault tolerance Processing to prevent the existence of non-data files
$ Fp = fopen ($ file, "w + ");
Fclose ($ fp );
Unset ($ fp );
}
$ Listnumber = 20; // number of entries displayed per page
$ Fp = file ($ file); // read data to the content
$ Number = count ($ fp); // calculates the total data volume
$ Pagenumber = floor ($ number/$ listnumber) + 1;
If ($ number <1 ){
Print "no record at the moment, please leave a message ";
/* + -------------------------------- +
| Print the FORM or link to the table here |
| URL, |
+ -------------------------------- + */
} Else {
If (empty ($ _ POST ["page"]) {// This section IF... ELSE... it is written to ensure compatibility with the default php4.20 settings and prevent invalid global variables.
$ Page = 0; // because it is read from the data text, it is saved in the array and has an O subscript.
} Else {
$ Page = $ _ POST ["page"]
}

If ($ page <0 | $ page> pagenumber) {// when the page parameter jumps out of the total page or is smaller than the homepage (0), it is returned to the first page.
$ Page = 0;
}

$ Startnote = $ page * $ listnumber; // start recording location
$ Endnote = $ startnote + $ listnumber; // end record location

// For ($ int_a = $ startnote; $ int_a <$ endnote; $ int_a ++) {// sorting display is similar to ASC Mode

Pirnt "<table>"

For ($ int_a = $ endnote; $ int_a >=$ startnote; $ int_a --) {// sort display is similar to DESC Mode
$ Info = explode ("\ t", $ fp [$ int-a]); // cut data to obtain detailed data for each record. Here we use a TAB key to separate
Print "<tr> <td> User: $ info [1] title $ info [2] content: $ info [3] Release Date: $ info [4] IP: $ info [5] ";
}

$ Prevpage = $ page-1; // Number of pages on the previous PAGE
$ Nextpage = $ page + 1; // Number of pages on the next page

Print "<tr> <td>
<A href = \ "$ _ SERVER [" PHP_SELF "]? Page = 0 \ "> homepage </a>
<A href = \ "$ _ SERVER [" PHP_SELF "]? Page = $ prevpage \ "> previous page </a>
<A href = \ "$ _ SERVER [" PHP_SELF "]? Page = $ nextpage \ "> next page </a>
<A href = \ "$ _ SERVER [" PHP_SELF "]? Page = $ pagenumber \ "> last page </a>
</Table> "; // here, You can directly add the page detection here. It is comfortable for others, but the effect is the same.
// For example, <a href = "index. php? Page = 21 "> next page </a> or <a href =" index. php? Page =-1 ">
}
?>
--- ==== EOF ==== ---


In addition, many of them changed because PHP4.20 was used. For example, PHP_SELF has already used _ SERVER ["PHP_SELF "].