With PHP 7.1, some PHP web applications fail because of deprecated code usage. This may result in an error message like
 operator not supported for strings for various Joomla! components. Here’s how to fix this code for PHP 7.1+.
I’ll use Joomla! as an example in this short post. The same error and fix may apply for other CMS systems.
First you have to enable Joomla! Debug modus, that’ll show you where the error is happening. Open up
public $debug to 1.
If you refresh the page now, you’ll see Joomla’s error page, telling you about Fatal error: Uncaught Error:
Fatal error: Uncaught Error:  operator not supported for strings D:\www\example.com\www\components\com_layer_slider\base\includes\slider_markup_init.php:98
OK, so we now know where the error is, it’s on line 98 in com_layer_slider’s
base\includes\slider_markup_init.php file. In this case, the failing code is:
You can fix this PHP error by first initializing
$data as an array:
A second method is to use the older style using
Let’s hope not too many Joomla! components, plugins and extensions use code like this. Not to mention other CMS systems like Expression Engine, WordPress, BuddyPress, PrestaShop…
WordPress premium Betheme theme by Muffin group needs a fix in the file
On line 150:
// $section_style = ''; $section_style = ;
WordPress Revolution Slider
Some (older?) versions of Revolution Slider plugin by ThemePunch has this same deprecated PHP code, and throws an error:
Uncaught Error:  operator not supported for strings in wp-content\plugins\revslider\includes\framework\base-admin.class.php:69
To fix this, add a line before line 69:
self::$arrMetaBoxes = ; # add this line to create the variable as an array self::$arrMetaBoxes = $box;