全文搜索效率，utf-8中 英文 数字 转ascii码

function uniord($c) {  $ud = 0;  if (ord($c{0})>=0 && ord($c{0})<=127)   $ud = ord($c{0});  if (ord($c{0})>=192 && ord($c{0})<=223)   $ud = (ord($c{0})-192)*64 + (ord($c{1})-128);  if (ord($c{0})>=224 && ord($c{0})<=239)   $ud = (ord($c{0})-224)*4096 + (ord($c{1})-128)*64 + (ord($c{2})-128);  if (ord($c{0})>=240 && ord($c{0})<=247)   $ud = (ord($c{0})-240)*262144 + (ord($c{1})-128)*4096 + (ord($c{2})-128)*64 + (ord($c{3})-128);  if (ord($c{0})>=248 && ord($c{0})<=251)   $ud = (ord($c{0})-248)*16777216 + (ord($c{1})-128)*262144 + (ord($c{2})-128)*4096 + (ord($c{3})-128)*64 + (ord($c{4})-128);  if (ord($c{0})>=252 && ord($c{0})<=253)   $ud = (ord($c{0})-252)*1073741824 + (ord($c{1})-128)*16777216 + (ord($c{2})-128)*262144 + (ord($c{3})-128)*4096 + (ord($c{4})-128)*64 + (ord($c{5})-128);  if (ord($c{0})>=254 && ord($c{0})<=255) //error   $ud = false; return $ud; } $str="中英文混杂。we are the hero! 123 34345"; for ($i=0;$i<mb_strlen($str,"GB2312");$i++) {     $tmp = sprintf("s",uniord(mb_substr($str,$i,1,"GB2312")));     echo $tmp," "; }