另一个在没有启用 MultiByte 的情况下重新编码的示例。
(俄罗斯 koi->win，如果输入已经是 win 编码，则函数 recode() 返回不变的字符串)
<?php
function detect_encoding($str) {
$win = 0;
$koi = 0;
for($i=0; $i<strlen($str); $i++) {
if( ord($str[$i]) >224 && ord($str[$i]) < 255) $win++;
if( ord($str[$i]) >192 && ord($str[$i]) < 223) $koi++;
}
if( $win < $koi ) {
return 1;
} else return 0;
}
function koi_to_win($string) {
$kw = array(128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 254, 224, 225, 246, 228, 229, 244, 227, 245, 232, 233, 234, 235, 236, 237, 238, 239, 255, 240, 241, 242, 243, 230, 226, 252, 251, 231, 248, 253, 249, 247, 250, 222, 192, 193, 214, 196, 197, 212, 195, 213, 200, 201, 202, 203, 204, 205, 206, 207, 223, 208, 209, 210, 211, 198, 194, 220, 219, 199, 216, 221, 217, 215, 218);
$wk = array(128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 225, 226, 247, 231, 228, 229, 246, 250, 233, 234, 235, 236, 237, 238, 239, 240, 242, 243, 244, 245, 230, 232, 227, 254, 251, 253, 255, 249, 248, 252, 224, 241, 193, 194, 215, 199, 196, 197, 214, 218, 201, 202, 203, 204, 205, 206, 207, 208, 210, 211, 212, 213, 198, 200, 195, 222, 219, 221, 223, 217, 216, 220, 192, 209);
$end = strlen($string);
$pos = 0;
do {
$c = ord($string[$pos]);
if ($c>128) {
$string[$pos] = chr($kw[$c-128]);
}
} while (++$pos < $end);
return $string;
}
function recode($str) {
$enc = detect_encoding($str);
if ($enc==1) {
$str = koi_to_win($str);
}
return $str;
}
?>
