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Home/ Questions/Can I fix the “call to a member function prepare() on a non-object” or not?
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Maira O'Sullivan
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Maira O'Sullivan
Asked: May 18, 20222022-05-18T21:03:08+00:00 2022-05-18T21:03:08+00:00In: php

Can I fix the “call to a member function prepare() on a non-object” or not?

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I get an error:

Fatal error: Call to a member function prepare() on a non-object in
 C:\Users\fel\VertrigoServ\www\login\validation.php on line 42

when I try to run the following code:

function repetirDados($email) {
  if(!empty($_POST['email'])) {
 
  $query = "SELECT email FROM users WHERE email = ?";
 
  $stmt = $pdo->prepare($query); // error line: line 42
 
  $email = mysql_real_escape_string($_POST['email']);
 
  $stmt->bindValue(1, $email);
 
  $ok = $stmt->execute();
 
  $results = $stmt->fetchAll(PDO::FETCH_ASSOC);
 
  if ($results == 0) {
  return true;
  } else {
  echo '<h1>something</h1>';
  return false;
  }
  }
  }

How to fix the call to a member function prepare() on a non-object. Please give me some good ideas.

call to a member function prepare
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    lyytutoria Expert
    2022-06-26T10:06:09+00:00Added an answer on June 26, 2022 at 10:06 am

    The cause:

    The error ”call to a member function prepare() on a non-object” happens in your program because $pdo is not determined. You don’t declare it in the function, and it isn’t considered as an argument. 

    Solution:

    To solve this problem, you need to specify $pdo in the area of global namespace so that it is always available to your function by adding global $pdo at the top (bad), or you can move it in (good).

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  2. Agathe Godard
    2022-05-25T21:12:46+00:00Added an answer on May 25, 2022 at 9:12 pm

    It is possible to create a function for a database connection on the same page as php and call it whenever you like. As,

    public function connection()
    {
     $dbc = new PDO("mysql:host=localhost;dbname=chat","root","");
    } 
    public function1()
    {
     this->connection();
     // now you have the connection.. now, time for to do some query..
    }
    
    public function2()
    {
     this->connection();
    // now do query stuffs..
    }

    You can also write the database connection line on that page whenever you need it. As,

    public function a()
    { // connecting DB for this function a only...
     $dbc = new PDO("mysql:host=localhost;dbname=chat","root","");
     // bla bla bla...
    }
    public function b()
    { // connecting DB for this function b only...
     $dbc = new PDO("mysql:host=localhost;dbname=chat","root","");
     // abra ke dabra... boom
    }
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