PHP error message: call to undefined function

(Disclaimer) MY php experience is approx 2 hours old and I have know idea what I am doing.

This is my error and I am wondering how do you know where the error is, for example.

as rendered in my browser, this is my error.

Fatal error: Call to undefined function array_key_exist() in 
/h开发者_Python百科ome/mjcrawle/public_html/cit/home/processlogin.php on line 47

Line 47 is actually if (array_key_exist('submit', $_post)){

I do not know if the error is before or after - this is my code.

/*Determine if the form data was submitted*/
if (array_key_exist('submit', $_post)){
    /*this removes left over data*/
    $emailaddress = sanitize($_post['emailaddress']);
    $password = sanitize($_POST['password']);

    /*verify form data*/
    $auth_status = validateLogin($emailaddress, $password); 
}

The function is array_key_exists, not array_key_exist :).

emphasis on the latter s

function name is array_key_exists() (your forgot S in "exists")

The error is saying that the function array_key_exist doesn't exist - reason for this is because you forgot to add an 's' at the end. The actual function name is array_key_exists.

Try this:

/*Determine if the form data was submitted*/
if (array_key_exists('submit', $_post)){

  /*this removes left over data*/
  $emailaddress = sanitize($_post['emailaddress']);
  $password = sanitize($_POST['password']);

  /*verify form data*/
  $auth_status = validateLogin($emailaddress, $password);
}