'Call to undefined function' - Trying to call function from an included file

Question

So I have two files, 'header.php' and 'pluginfile.php'

The function that I want to call resides in 'pluginfile.php' and is:

public function getNonSubscriptionAmount() {
    $total = 0;
    foreach($this->_items as $item) {
      if(!$item->isSubscription()) {
        $total += $item->getProductPrice() * $item->getQuantity();
      }
      else {
        // item is subscription
        $basePrice = $item->getBaseProductPrice();
        Cart66Common::log('[' . basename(__FILE__) . ' - line ' . __LINE__ . "] Item is a subscription with base price $basePrice");
        $total += $basePrice;
      }
    }
    return $total;
  }

So in 'header.php' I have:

<?php
include_once($_SERVER['DOCUMENT_ROOT']."/wp-content/plugins/plugin-name/folder/PluginFile.php");
print getNonSubscriptionAmount();
?>

This gives the following error when any page is loaded:

Fatal error: Call to undefined function getnonsubscriptionamount() in /home/username/domain.com/wp-content/themes/theme/header.php on line 72

I've spent a couple of hours now trying to figure this out alone and am getting nowhere! Any help much appreciated!

You might try changing your include_once to a require_once which can make sure the file is being properly included in case there is something going on with the pathing. — SidewaysGravity
– SidewaysGravity, Commented Aug 17, 2012 at 17:55
public function ... This tells me it's defined as a class method, but you're calling it as though it's a standalone function. — Wiseguy
– Wiseguy, Commented Aug 17, 2012 at 17:55
You need to instantiate an object of that class and call it from the object. For example, $obj = new SomeClass; print $obj->getNonSubscriptionAmount(); More info about class methods in the docs here. — Wiseguy
– Wiseguy, Commented Aug 17, 2012 at 18:05
Glad you got it to work, but like I said, maybe the correct data won't be populated yet so you won't get useful values. :-/ I'd have to actually submit an answer for you to accept it. @SidewaysGravity said the same thing, so I'd suggest selecting his. I just added a bit of clarification. — Wiseguy
– Wiseguy, Commented Aug 17, 2012 at 20:15

SidewaysGravity · Accepted Answer · 2012-08-17 18:10:56Z

1

@Wiseguy looks like he had the right idea put in the comments.

You are declaring a method and not a function. Is the function the entirety of your plugin.php file or is there more? If it is everything, remove the public modifier and just declare

function getNonSubscriptionAmount() {
  // code here
}

But from the looks of the code it is part of a larger class. If thats the case then @Wiseguy comment is right on, you need to instantiate a new object of the class in plugin.php and then the desired method.

$obj = new PluginClass();
$obj->getNonSubscriptionAmount();

edited Aug 17, 2012 at 18:10

answered Aug 17, 2012 at 18:04

SidewaysGravity

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1 Comment

Jambo Over a year ago

I'm still unsure of where I put this in my code, I just get errors!

mr-sk · Accepted Answer · 2012-08-17 18:10:24Z

0

You said:

The function that I want to call resides in 'plugin.php' and is:

And in your file you are including:

So in 'header.php' I have: include_once($_SERVER['DOCUMENT_ROOT']."/wp-content/plugins/plugin-name/folder/PluginFile.php"); print getNonSubscriptionAmount();

You are not including 'plugin.php' which is were the function lives.

Header.php should include 'plugin.php', not 'PluginFile.php'.

answered Aug 17, 2012 at 18:10

mr-sk

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2 Comments

Jambo Over a year ago

apologies that was my mistake in writing the question!

mr-sk Over a year ago

Word, in that case my answer is of no help, hah.

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