Online PHP editor | refs for 4eFNt

@ 2015-09-11T12:44:06Z

<?php

function replace4byte($string) {
    return preg_replace('%(?:
          \xF0[\x90-\xBF][\x80-\xBF]{2}      # planes 1-3
        | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
        | \xF4[\x80-\x8F][\x80-\xBF]{2}      # plane 16
    )%xs', '', $string);    
}

echo replace4byte(\u2019);