yfix/yf

.dev/samples/register_output_filter.class.php

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<?php

class register_output_filter
{
    public function show()
    {
        tpl()->register_output_filter(function ($body) {
            return preg_replace('/<head>/ims', '<head>' . PHP_EOL . '<meta name="keywords" value="test">', $body);
        });
    }
}