Sometimes in your WordPress theme you need to execute custom php code in a widget, because you want to display different information according to the category you are in, or simply because you need to execute a php script into that widget.There are a lot of plugins doing this task, adding a new type of widget generally called “php widget”, but rather than installing a plugin this simple job can be done simply adding in functions.php file of your theme these few lines:

add_filter(‘widget_text’,’execute_php’,100);

function execute_php($html){

if(strpos($html,”<“.”?php”)!==false){

ob_start();

eval(“?”.”>”.$html);

$html=ob_get_contents();

ob_end_clean();

}

return $html;

}

via Executing php inside a WordPress widget without any plugin – Emanuele Feronato.

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