CREATE PROCEDURE SP(IN _start INT,IN _end INT,INOUT _count INT)
BEGIN

   SET _count = (SELECT COUNT(*) FROM tbl);

   SET @qry = CONCAT('select * from tbl limit ', _start, ',', _end);

   PREPARE stmt FROM @qry;
   EXECUTE stmt;
   DEALLOCATE PREPARE stmt;

END

$c=0; 
$stmt = $this->_dbc->getConnection()->prepare("CALL SP(0,10,:count)"); 
    $stmt->bindParam(":count",$c,PDO::PARAM_INT|PDO::PARAM_INPUT_OUTPUT,0); 
    $stmt->execute(); 
    return $c; 
PDOException' with message 'SQLSTATE[42000]: Syntax error or access violation: 1414 OUT or INOUT argument 3 for routine db22.SP is not a variable or NEW pseudo-variable in BEFORE trigger

[php]$this->_dbc->getConnection()->prepare("CALL SP(0,10,:count)");

$this->_dbc->getConnection()->prepare("CALL SP(0,10,@count)");