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Fatal error: Uncaught Error: [] operator not supported for strings – PHP 7.1

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 configuration.php and 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

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:

$data[] = '<script type="text/javascript">' . NL;

You can fix this PHP error by first initializing $data[] as an array:

$data = [];
$data[] = '<script type="text/javascript">' . NL;

A second method is to use the older style using array():

$data = array();
$data[] = '<script type="text/javascript">' . NL;

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…

Update 3-3-2018:
WordPress premium Betheme theme by Muffin group needs a fix in the file


On line 150:

// $section_style         = '';
$section_style         = [];

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About the Author Jan Reilink

My name is Jan. I am not a hacker, coder, developer, programmer or guru. I am merely a system administrator, doing my daily thing at Vevida in the Netherlands. With over 15 years of experience, my specialties include Windows Server, IIS, Linux (CentOS, Debian), security, PHP, websites & optimization.

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