php - mysql FOUND_ROWS() return wrong value -


i'm trying use found_rows() in query, function returns wrong values sometimes.

select sql_calc_found_rows adminslog.*, admins.fullname adminslog  join admins on admins.id=adminslog.userid order date desc limit 0,12

in query, right value some, in others limit has wrong value.

limit 0,12        164rows        right limit 12,12       164rows        right limit 36,12       164rows        right limit 48,12       164rows        right limit 50,12       60rows         wrong limit 62,12       60rows         wrong

here class construct:

class list_table { public $number,$page_number,$all_rec,$table_rows,$query_str,$query,$fetch,$table,$db,$fields,$i=0,$page_n,$onclick;  function __construct($query_str,$fields,$page_n,$onclick,$page_number,$number,$db) {     $this->fields = $fields; $this->page_number = (((int)$page_number<1)?1:(int)$page_number); $this->number = (int)$number; $this->db = $db;     $this->i = $this->page_number*$this->number-$this->number; $this->page_n = $page_n; $this->onclick = $onclick;     $this->query_str = substr(trim($query_str),0,7)."sql_calc_found_rows ".substr(trim($query_str),7)." limit ".(($this->page_number*$this->number)-$this->number).",".$this->number;      $this->query = $this->db->query($this->query_str);     $this->table_rows = $this->db->query("select found_rows()")->fetchcolumn();      $this->all_rec = $this->query->rowcount();     $this->fetch = $this->query->fetch();      //$this->table_rows = $this->table_rows->fetch();     //$this->table_rows = $this->table_rows['cnt'];     print $this->table_rows; }  other functions... }

question: think first found_rows() right every time in every query?

check that,if true can run code in first query , save session.

if($this->page_number==1) $_session['cr'] = $this->table_rows = $this->db->query("select found_rows()")->fetchcolumn();

in way have not check row counts every time.


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