Call to a member function execute() on a non-object

[sonal2829]

Warning: call_user_func_ array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in C:\xampp\htdocs \project\module s\Sql.php on line 23


call_user_func_ array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in C:\xampp\htdocs \project\module s\Sql.php on line 24


below is the code of Sql.php

<?php
abstract class Sql{
    public static $mysqli=null;
    public static function init($DB){
        if(!isSet(self::$mysqli))
            self::$mysqli=$DB;
    }
    public static function query($query,$param_string="",$param_array=array()){//used in void type query like insert,delete,update
        $stmt=self::$mysqli->prepare($query);
        array_unshift($param_array,$param_string);
        if(count($param_array)>1)
            call_user_func_array(array($stmt,'bind_param'),$param_array);
        $stmt->execute();
        $ans=max(self::$mysqli->affected_rows,self::$mysqli->insert_id);
        $stmt->close();
        return $ans;
    }
 
    public static function getArray($query,$param_string="",$param_array=array()){//used in select type query
        $stmt=self::$mysqli->prepare($query);
        array_unshift($param_array,$param_string);
        if(count($param_array)>1)
            call_user_func_array(array($stmt,'bind_param'),$param_array);
        $stmt->execute();
        $result=$stmt->result_metadata();
        $row=array();
        $temp=array();
        $params=array();//list of location,of some pointer where value of answill come.
 
        while($field=$result->fetch_field()){
            $row[$field->name]=null;
            $params[]=$field->name;
            $temp[]=&$row[$field->name];
        }
        call_user_func_array(array($stmt,'bind_result'),$temp);
        $out=array();
        while($stmt->fetch()){
            $thisRow=array();
            for($i=0;$i<count($row);$i++){
                $thisRow[$params[$i]]=$row[$params[$i]];
            }
            $out[]=$thisRow;
        }
        $stmt->close();
        return $out;
    }
    public static function getArrayLength($query,$param_string="",$param_array=array()){//used in select type query, to know length only
        $stmt=self::$mysqli->prepare($query);
        array_unshift($param_array,$param_string);
        if(count($param_array)>1)
            call_user_func_array(array($stmt,'bind_param'),$param_array);
        $stmt->execute();
        $stmt->store_result();
        $numRows=$stmt->num_rows;
        $stmt->close();
        return $numRows;
    }
}
 
?>

the above error is coming on running the project , Please resolve the problem anyone or give some solution.

[Dormilich]

call_user_func_ array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object

it’s like in the message, make sure you pass the correct data. and if the logic doesn’t seem off, test the variables to see what they actually contain.