Magento 1.9.2 and php7 - image upload error

Question

I'm just testing Magento 1.9.2 with Php 7. All seemed to work, but suddenly I tried to upload image for the product. I got error like below:

Fatal error</b>:  Uncaught Error: Function name must be a string in /home/admin/domains/store.com/public_html/dev/lib/Varien/File/Uploader.php:259
Stack trace:
#0 /home/admin/domains/store.com/public_html/dev/lib/Varien/File/Uploader.php(180): Varien_File_Uploader-&gt;_validateFile()
#1 /home/admin/domains/store.com/public_html/dev/app/code/core/Mage/Adminhtml/controllers/Catalog/Product/GalleryController.php(46): Varien_File_Uploader-&gt;save('/home/admin/dom...')
#2 /home/admin/domains/store.com/public_html/dev/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Adminhtml_Catalog_Product_GalleryController-&gt;uploadAction()
#3 /home/admin/domains/store.com/public_html/dev/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action-&gt;dispatch('upload')
#4 /home/admin/domains/store.com/public_html/dev/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard-&gt;match(Object(Mage_Core_Controller in <b>/home/admin/domains/store.com/public_html/dev/lib/Varien/File/Uploader.php

Anybody know how to fix it?

Function affected in upload.php at line around 259

protected function _validateFile()
    {
        if ($this->_fileExists === false) {
            return;
        }

        //is file extension allowed
        if (!$this->checkAllowedExtension($this->getFileExtension())) {
            throw new Exception('Disallowed file type.');
        }
        //run validate callbacks
        foreach ($this->_validateCallbacks as $params) {
            if (is_object($params['object']) && method_exists($params['object'], $params['method'])) {
                $params['object']->$params['method']($this->_file['tmp_name']);
            }
        }
    }

Answer 1

http://php.net/manual/de/migration70.incompatible.php https://wiki.php.net/rfc/uniform_variable_syntax

Due to uniform variable syntax the code is now interpreted strictly from left to right.

The line

$params['object']->$params['method']($this->_file['tmp_name']);

should be

$params['object']->{$params['method']}($this->_file['tmp_name']);

You can find a overview of all files to edit in this answer.

Answer 2

In Addition to the answers above, don't forget to check the file:

\includes\src\Varien_File_Uploader.php on line 259

Replace

$params['object']->$params['method']($this->_file['tmp_name']);

with

$params['object']->{$params['method']}($this->_file['tmp_name']);