这段代码做了什么？ [英] what does this code do?

问题描述

嘿，有人可以解释这段代码的作用。我不完全确定，因为我是PHP和mySql.Thanks的新手。





如果有人可以评论代码，（我知道那是要求很多）我会很开心！祝你有愉快的一天

 $ pp = 4; 
 
  if （空（$ _ GET ['  page_number']））
 {
  //  默认页面/ total = 1  
 $ pg = 0; 
  //  获取总页数 
 $ query_get_all =   SELECT * FROM pictures order by id ASC; 
 $ res_get_all = mysql_query（$ query_get_all）或 die（mysql_error（））; 
 $ get_all = mysql_num_rows（$ res_get_all）; 
 
 $ pgtotal = $ get_all; 
  if （$ pgtotal％$ pp == 0）{
 $ pgtotal / = $ pp; 
  $ pgtotal  -  ; 
} 
 其他 {
 $ pgtotal / = $ pp;  //   $ pgtotal ++;  
 $ pgtotal = floor（$ pgtotal）; 
} 
 
} 
  else  
 {
 $ pg = intval（strip_tags（$ _GET ['  page_number']）） -  1; 
  //  获取总页数 
 
 $ query_get_all =   SELECT * FROM pictures by id ASC; 
 $ res_get_all = mysql_query（$ query_get_all）或 die（mysql_error（））; 
 $ get_all = mysql_num_rows（$ res_get_all）; 
 
 $ pgtotal = $ get_all; 
  if （$ pgtotal％$ pp == 0）{
 $ pgtotal / = $ pp; 
  $ pgtotal  -  ; 
} 
 其他 {
 $ pgtotal / = $ pp;  //   $ pgtotal ++;  
 $ pgtotal = floor（$ pgtotal）; 
} 
} 
 
 $ lim_inf = $ pg * $ pp; 
 $ lim_sup = $ lim_inf + $ pp; 
 
  $ select_picture  =   SELECT * FROM pictures ORDER BY id ASC LIMIT $ lim_inf，$ pp; 
 
 $ result_select_picture = mysql_query（$ select_picture）或 die（mysql_error（））; 
  $ noproducts  = mysql_num_rows（$ result_select_picture）; 
 ？>  

解决方案

pp = 4;

if （空（

_GET ['' page_number']））
{
// 默认页面/总计= 1

pg = 0;
// 获取总页数

hey, can someone please explain what this code does. am not entirely sure as i am new to PHP and mySql.Thanks


If someone could comment the code, ( i know that is asking for a lot) I would be SO HAPPY!, have a nice day

$pp=4;

if (empty($_GET['page_number']))
{
        //default page/total = 1
        $pg=0;
        //get total num of pages
        $query_get_all="SELECT * FROM pictures order by id ASC";
        $res_get_all=mysql_query($query_get_all) or die(mysql_error());
        $get_all=mysql_num_rows($res_get_all);

        $pgtotal=$get_all;
        if ( $pgtotal%$pp==0) {
            $pgtotal/=$pp;
            $pgtotal--;
        }
        else {
            $pgtotal/=$pp; //$pgtotal++;
            $pgtotal=floor($pgtotal);
        }

}
else
{
        $pg=intval(strip_tags($_GET['page_number']))-1;
        //get total num of pages

        $query_get_all="SELECT * FROM pictures order by id ASC";
        $res_get_all=mysql_query($query_get_all) or die(mysql_error());
        $get_all=mysql_num_rows($res_get_all);

        $pgtotal=$get_all;
        if ( $pgtotal%$pp==0) {
            $pgtotal/=$pp;
            $pgtotal--;
        }
        else {
            $pgtotal/=$pp; //$pgtotal++;
            $pgtotal=floor($pgtotal);
        }
}

    $lim_inf=$pg*$pp;
    $lim_sup=$lim_inf+$pp;

    $select_picture = "SELECT * FROM pictures  ORDER BY id ASC LIMIT $lim_inf,$pp ";

    $result_select_picture=mysql_query($select_picture) or die(mysql_error());
    $noproducts = mysql_num_rows($result_select_picture);
?>

解决方案

pp=4; if (empty(

_GET['page_number'])) { //default page/total = 1

pg=0; //get total num of pages

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