mb_substr修正函数
用于不支持mb_substr的地方
// Patch in multibyte support
if (!function_exists('mb_substr')) {
function mb_substr($str, $start, $len = '', $encoding="UTF-8"){
$limit = strlen($str);
for ($s = 0; $start > 0;--$start) {// found the real start
if ($s >= $limit)
break;
if ($str[$s] <= "\x7F")
++$s;
else {
++$s; // skip length
while ($str[$s] >= "\x80" && $str[$s] <= "\xBF")
++$s;
}
}
if ($len == '')
return substr($str, $s);
else
for ($e = $s; $len > 0; --$len) {//found the real end
if ($e >= $limit)
break;
if ($str[$e] <= "\x7F")
++$e;
else {
++$e;//skip length
while ($str[$e] >= "\x80" && $str[$e] <= "\xBF" && $e < $limit)
++$e;
}
}
return substr($str, $s, $e - $s);
}
}
if (!function_exists('mb_substr')) {
function mb_substr($str, $start, $len = '', $encoding="UTF-8"){
$limit = strlen($str);
for ($s = 0; $start > 0;--$start) {// found the real start
if ($s >= $limit)
break;
if ($str[$s] <= "\x7F")
++$s;
else {
++$s; // skip length
while ($str[$s] >= "\x80" && $str[$s] <= "\xBF")
++$s;
}
}
if ($len == '')
return substr($str, $s);
else
for ($e = $s; $len > 0; --$len) {//found the real end
if ($e >= $limit)
break;
if ($str[$e] <= "\x7F")
++$e;
else {
++$e;//skip length
while ($str[$e] >= "\x80" && $str[$e] <= "\xBF" && $e < $limit)
++$e;
}
}
return substr($str, $s, $e - $s);
}
}
谢谢，正在找