PHP error message: call to undefined function

Question

(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 
/home/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); 
}

Almost in all cases the error points to the line on where the error is, like in your case with a wrong function name. PS: variables are case sensitive, $_POST != $_post — meze
– meze, Commented Feb 5, 2011 at 12:47
The array_key_exists snippet originates in a bad tutorial. Use isset($_POST["submit"]) or just if ($_POST["submit"]) if you want debug information. Also I have a hunch the sanitize() function might not be a stellar implementation either. — mario
– mario, Commented Feb 5, 2011 at 12:52
@mario why is array_key_exists bad? The only difference is that isset returns false if a variable is set to null. — meze
– meze, Commented Feb 5, 2011 at 12:56
@meze: Entries in $_GET or $_POST are never going to contain NULL anyway. There are empty strings at best. Hence a normal boolean check is sufficient; testing for the key is overdoing it. — mario
– mario, Commented Feb 5, 2011 at 12:58
⁺¹ cuz you were the first of ≈800 peoples who mistyped the function. — Hi-Angel
– Hi-Angel, Commented Feb 17, 2015 at 9:35

RobertPitt · Accepted Answer · 2011-02-05 12:46:23Z

7

The function is array_key_exists, not array_key_exist :).

emphasis on the latter s

edited Feb 5, 2011 at 12:46

RobertPitt

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answered Feb 5, 2011 at 12:42

Matthew Iselin

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1 Comment

Michael Crawley Over a year ago

Thanks... Wow, Looks like I am in for a long day.

Chvanikoff · Accepted Answer · 2011-02-05 12:42:46Z

2

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

answered Feb 5, 2011 at 12:42

Chvanikoff

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Comments

xil3 · Accepted Answer · 2011-02-05 12:44:10Z

0

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);
}

answered Feb 5, 2011 at 12:44

xil3

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