PHP - array_push() expects parameter 1 to be array, null given

winston

`$arrMessages = array();

function AddMessage($strMsg)
{
global $arrMessages;

array_push($arrMessages, $strMsg);
}`

When calling AddMessage further down in the code I get array_push() expects parameter 1 to be array, null given

I'm absolutely dumbfounded by this....please help !

EDIT: Weirdest thing I've ever seen, I need to define it as a global before defining it as an array, and then define the global again inside the function....

Corey

Why not just use $arrMessages[] = $strMsg;

telephone

Think of a function as a sandbox. You need to define the input variables you're going to be using, or as you mentioned use global (which is not advised!).

$arrMessages = array();

function AddMessage($array, $msg)
{
    return array_push($array, $msg);
}

Or you can typecast:

function AddMessage(array $array, $msg)
{
    return array_push($array, $msg);
}

Or as Corey mentioned:

$arrMessages[] = $strMsg;

NickM

@Corey said: Why not just use $arrMessages[] = $strMsg;

Agreed. Even the PHP docs say to use this method instead of array_push.

Corey

@NickM said: Agreed. Even the PHP docs say to use this method instead of array_push.

From PHP Docs ->

Note: If you use array_push() to add one element to the array it's better to use $array[] = because in that way there is no overhead of calling a function. 

winston

changed it to $arrMessages[] = $strMsg;

thanks!