The called constructor method for WP_Widget in GFWidget is deprecated since version 4.3.0! Use

You are using a deprecated way to declare widgets. WordPress is anticipating on constructor being deprecated in PHP 7.0, in favour of __construct. Please refer to the Widgets API to see how widgets are constructed these days.

If the GFWidget you mention is generated by a plugin that plugin is very much outdated and probably shouldn’t be used anymore.

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