PHP获取文字的首字母

function getfirstchar($s0) {
$fchar = ord(substr($s0, 0, 1));
if (($fchar >= ord(“a”) and $fchar <= ord("z"))or($fchar >= ord(“A”) and $fchar <= ord("Z"))) return strtoupper(chr($fchar)); $s = iconv("UTF-8", "GBK", $s0); $asc = ord($s{0}) * 256 + ord($s{1})-65536; if ($asc >= -20319 and $asc <= -20284)return "A"; if ($asc >= -20283 and $asc <= -19776)return "B"; if ($asc >= -19775 and $asc <= -19219)return "C"; if ($asc >= -19218 and $asc <= -18711)return "D"; if ($asc >= -18710 and $asc <= -18527)return "E"; if ($asc >= -18526 and $asc <= -18240)return "F"; if ($asc >= -18239 and $asc <= -17923)return "G"; if ($asc >= -17922 and $asc <= -17418)return "H"; if ($asc >= -17417 and $asc <= -16475)return "J"; if ($asc >= -16474 and $asc <= -16213)return "K"; if ($asc >= -16212 and $asc <= -15641)return "L"; if ($asc >= -15640 and $asc <= -15166)return "M"; if ($asc >= -15165 and $asc <= -14923)return "N"; if ($asc >= -14922 and $asc <= -14915)return "O"; if ($asc >= -14914 and $asc <= -14631)return "P"; if ($asc >= -14630 and $asc <= -14150)return "Q"; if ($asc >= -14149 and $asc <= -14091)return "R"; if ($asc >= -14090 and $asc <= -13319)return "S"; if ($asc >= -13318 and $asc <= -12839)return "T"; if ($asc >= -12838 and $asc <= -12557)return "W"; if ($asc >= -12556 and $asc <= -11848)return "X"; if ($asc >= -11847 and $asc <= -11056)return "Y"; if ($asc >= -11055 and $asc <= -10247)return "Z"; return null; } function get_letter($string) { $charlist = mb_str_split($string); return implode(array_map("getfirstchar", $charlist)); } function mb_str_split($string) { // Split at all position not after the start: ^ // and not before the end: $ return preg_split('/(?

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