#D├ętecter efficacement UTF-8 #http://stackoverflow.com/questions/910793/detect-encoding-and-make-everything-utf-8 function detectUTF8($string) { return preg_match('%(?: [xC2-xDF][x80-xBF] # non-overlong 2-byte |xE0[xA0-xBF][x80-xBF] # excluding overlongs |[xE1-xECxEExEF][x80-xBF]{2} # straight 3-byte |xED[x80-x9F][x80-xBF] # excluding surrogates |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); }