Example of PHP Paging Class Based on Object Oriented Encapsulation

In this paper, the paging class based on object-oriented encapsulation in PHP is described as an example. Share it for your reference, as follows:

<?php
  class Page
  {
    protected $num;// Number of items displayed per page 
    protected $total;// Total number of records 
    protected $pageCount;// Total pages 
    protected $current;// Current page number 
    protected $offset;// Offset 
    protected $limit;// Pagination page number 
    /**
     *  Construction method 
     * @param int $total  Total number of records 
     * @param int $num   Number of items displayed per page 
     */
    public function __construct($total,$num=5)
    {
      //1. Number of items displayed per page 
      $this->num = $num;
      //2. Total number of records 
      $this->total = $total;
      //3. Total pages 
      $this->pageCount = ceil($total/$num);
      //4. Offset 
      $this->offset = ($this->current-1)*$num;
      //5. Pagination page number 
      $this->limit = "{$this->offset},{$this->num}";
      //6. Initialize the current page 
      $this->current();
    }
    /**
     *  Initialize the current page 
     */
    public function current(){
      $this->current = isset($_GET['page'])?$_GET['page']:'1';
      // Determine the maximum range of the current page 
      if ($this->current>$this->pageCount){
        $this->current = $this->pageCount;
      }
      // Determine the minimum range of the current page 
      if ($this->current<1){
        $this->current = 1;
      }
    }
    /**
     *  To access properties that you do not have permission to access 
     * @param string $key  Attributes you want to access 
     * @return float|int|string  Returns the corresponding condition to be changed 
     */
    public function __get($key){
      if ($key == "limit") {
        return $this->limit;
      }
      if ($key == "offset") {
        return $this->offset;
      }
      if ($key == "current") {
        return $this->current;
      }
    }
    /**
     *  Handle paging buttons 
     * @return string  Spliced paging buttons 
     */
    public function show(){
      // Determine the initial page number 
      $_GET['page'] = isset($_GET['page'])?$_GET['page']:'1';
      // Will $_GET Values are assigned to upper and lower variables 
      $first = $end = $prev = $next = $_GET;
      // var_dump($prev);
      // Upper 1 Page 
      // On judgment 1 Page range 
      if ($this->current-1<1){
        $prev['page'] = 1;
      }else{
        $prev['page'] = $this->current-1;
      }
      // Under 1 Page 
      // Under judgment 1 Page range 
      if ($this->current+1>$this->pageCount) {
        $next["page"] = $this->pageCount;
      }else{
        $next['page'] = $this->current+1;
      }
      /*
       Home page 
      $first['page'] = 1; 
      // End page 
      $end['page'] = $this->pageCount;
      */
      // Splice path 
      $url = "http://".$_SERVER["SERVER_NAME"].$_SERVER["SCRIPT_NAME"];
      // Splice array url Address bar suffix ? Pass in parameters 
      //http://xxx/xxx/Page.class.php?page= Value 
      $prev = http_build_query($prev);
      $next = http_build_query($next);
      // $first = http_build_query($first);
      // $end = http_build_query($end);
      // Splice full path 
      $prevpath = $url."?".$prev;
      $nextpath = $url."?".$next;
      // $firstpath = $url."?".$first;
      // $endpath = $url."?".$end;
      $str = " Shared {$this->total} A record   Shared {$this->pageCount} Page  ";
      $str .= "<a href='{$url}?page=1'> Home page </a> ";
      $str .= "<a href='{$prevpath}'> Upper 1 Page </a> ";
      $str .= "<a href='{$nextpath}'> Under 1 Page </a> ";
      $str .= "<a href='{$url}?page={$this->pageCount}'> End page </a> ";
      return $str;
    }
  }
  // Self-debugging 
  $a = new Page(10);
  echo $a->show();
?>

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I hope this article is helpful to everyone's PHP programming.