PHP Generic paging class page. php [Imitation google paging] _ PHP-php Tutorial

PHP Generic paging class. This code is used for paging. a slight modification can be used for various programs. For usage instructions, see my article. Page. php
The code is as follows:

/**
** Generic php paging class. (Like Google style)
** You only need to provide two parameters: the total number of records and the number of records displayed on each page. (Detailed instructions are provided ..)
** You do not need to specify a URL. the link is generated by the program. It is convenient for querying results by page.
** The form is submitted using the GET method, which ensures that URL parameters are not lost in operations such as query and deletion.
**/

Class Pager {
// IE address bar
Var $ url;
// The total number of records
Var $ countall;
// Total number of pages
Var $ page;
// Pagination numeric link
Var $ thestr;
// Home page and previous page
Var $ backstr;
// Link to the last page and Next page
Var $ nextstr;
// Current page number
Var $ pg;
// Number of records displayed per page
Var $ countlist;
// Flip style
Var $ style;
// Constructor. This function is automatically executed when the class is instantiated.
Function Pager ($ countall, $ countlist, $ style = "page "){
// When the number of records is different from the number displayed on each page, add 1 after the remaining number of pages
$ This-> countall = $ countall;
$ This-> countlist = $ countlist;
$ This-> style = $ style;
If ($ this-> countall % $ this-> countlist! = 0 ){
$ This-> page = sprintf ("% d", $ this-> countall/$ this-> countlist) + 1;
} Else {
$ This-> page = $ this-> countall/$ this-> countlist;
}

$ This-> pg =$ _ GET ["pg"];
// Ensure that pg starts from page 1st if not specified
If (! Ereg ("^ [1-9] [0-9] * $", $ this-> pg) | empty ($ this-> pg )){
$ This-> pg = 1;
}
// The page number exceeds the maximum value.
If ($ this-> pg >$ this-> page ){
$ This-> pg = $ this-> page;
}
// Obtain the current URL. For specific implementation, see the function entity at the bottom.
$ This-> url = Pager: getUrl ();
// Replace the page number with the correct format
If (isset ($ _ GET ["pg"]) & $ _ GET ["pg"]! = $ This-> pg ){
$ This-> url = str_replace ("? Pg = ". $ _ GET [" pg "],"? Pg = $ this-> pg ", $ this-> url );
$ This-> url = str_replace ("& pg = ". $ _ GET ["pg"], "& pg = $ this-> pg", $ this-> url );
}
// Generate a page with numbers such as 12345.
If ($ this-> page <= 10 ){
For ($ I = 1; $ I <$ this-> page + 1; $ I ++ ){
$ This-> thestr = $ this-> thestr. Pager: makepg ($ I, $ this-> pg );
}
} Else {
If ($ this-> pg <= 5 ){
For ($ I = 1; $ I <10; $ I ++ ){
$ This-> thestr = $ this-> thestr. Pager: makepg ($ I, $ this-> pg );
}
} Else {
If (6 + $ this-> pg <= $ this-> page ){
For ($ I = $ this-> PG-4; $ I <$ this-> pg + 6; $ I ++ ){
$ This-> thestr = $ this-> thestr. Pager: makepg ($ I, $ this-> pg );
}
} Else {
For ($ I = $ this-> PG-4; $ I <$ this-> page + 1; $ I ++ ){
$ This-> thestr = $ this-> thestr. Pager: makepg ($ I, $ this-> pg );
}

}
}
}
// Generate text links such as the top and bottom pages
$ This-> backstr = Pager: gotoback ($ this-> pg );
$ This-> nextstr = Pager: gotonext ($ this-> pg, $ this-> page );
// Echo ("total ". $ this-> countall. "entries, per page ". $ this-> countlist. "entries, total ". $ this-> page. "page ". $ this-> backstr. $ this-> thestr. $ this-> nextstr );
}
// Auxiliary function for generating digital paging
Function makepg ($ I, $ pg ){
If ($ I = $ pg ){
Return "style." '> ". $ I ."";
} Else {
Return "url, 5, $ I)." class = '". $ this-> style."'> ". $ I ."";
}
}
// Function for generating information such as the previous page
Function gotoback ($ pg ){
If ($ PG-1> 0 ){
Return $ this-> gotoback = "url, 3, 0 ). "class = '". $ this-> style. "'> homepage url, 2, 0 ). "class = '". $ this-> style. "'> Previous Page ";
} Else {
Return $ this-> gotoback = "style." '> homepage previous page ";
}
}
// Function for generating information such as the next page
Function gotonext ($ pg, $ page ){
If ($ pg <$ page ){
Return "url, 1, 0 ). "class = '". $ this-> style. "'> Next Page url, 4, 0 ). "class = '". $ this-> style. "'> last page ";
} Else {
Return "style." '> last page of the next page ";
}
}
// Process the $ pg method in the url, which is used to automatically generate pg = x
Function replacepg ($ url, $ flag, $ I ){
If ($ flag = 1 ){
$ Temp_pg = $ this-> pg;
Return str_replace ("pg =". $ temp_pg, "pg =". ($ this-> pg + 1), $ url );
} Else if ($ flag = 2 ){
$ Temp_pg = $ this-> pg;
Return str_replace ("pg =". $ temp_pg, "pg =". ($ this-> PG-1), $ url );
} Else if ($ flag = 3 ){
$ Temp_pg = $ this-> pg;
Return str_replace ("pg =". $ temp_pg, "pg = 1", $ url );
} Else if ($ flag = 4 ){
$ Temp_pg = $ this-> pg;
Return str_replace ("pg =". $ temp_pg, "pg =". $ this-> page, $ url );
} Else if ($ flag = 5 ){
$ Temp_pg = $ this-> pg;
Return str_replace ("pg =". $ temp_pg, "pg =". $ I, $ url );
} Else {
Return $ url;
}
}
// Obtain the current URL
Function getUrl (){
$ Url = "http: //". $ _ SERVER ["HTTP_HOST"];
If (isset ($ _ SERVER ["REQUEST_URI"]) {
$ Url. = $ _ SERVER ["REQUEST_URI"];
} Else {
$ Url. = $ _ SERVER ["PHP_SELF"];
If (! Empty ($ _ SERVER ["QUERY_STRING"]) {
$ Url. = "? ". $ _ SERVER [" QUERY_STRING "];
}
}
// Add pg = x to the current URL
If (! Ereg ("(pg = | PG = | pG = | Pg =)", $ url )){
If (! Strpos ($ url ,"? ")){
$ Url = $ url ."? Pg = 1 ";
} Else {
$ Url = $ url. "& pg = 1 ";
}
}
Return $ url;
}
}
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