PHP GBK and UTF8 encoding processing _php Tutorials

Source: Internet
Author: User
One, the coding range
1. GBK (gb2312/gb18030)
X00-xff GBK Double byte encoding range
x20-x7f ASCII
Xa1-xff Chinese
X80-xff Chinese

2. UTF-8 (Unicode)
U4E00-U9FA5 (English)
x3130-x318f (Korean)
XAC00-XD7A3 (Korean)
u0800-u4e00 (Japanese)
PS: Korean is more than [U9FA5] characters

The regular example:
Preg_replace ("/([X80-xff])/", "", $str);
Preg_replace ("/([U4E00-U9FA5])/", "", $str);

Second, the code example

There is no Chinese-GBK (PHP) in the judging content
function Check_is_chinese ($s) {
Return Preg_match (/[x80-xff]./, $s);
}
Get string length-GBK (PHP)
function Gb_strlen ($STR) {
$count = 0;
for ($i =0; $i
$s = substr ($str, $i, 1);
if (Preg_match ("/[x80-xff]/", $s)) + + $i;
+ + $count;
}
return $count;
}
Intercepting string Strings-GBK (PHP)
function Gb_substr ($STR, $len) {
$count = 0;
for ($i =0; $i
if ($count = = $len) break;
if (Preg_match ("/[x80-xff]/", substr ($str, $i, 1)) + + $i;
+ + $count;
}
Return substr ($str, 0, $i);
}
Statistical string length-utf8 (PHP)
function Utf8_strlen ($STR) {
$count = 0;
for ($i = 0; $i < strlen ($STR); $i + +) {
$value = Ord ($str [$i]);
if ($value > 127) {
$count + +;
if ($value >= 192 && $value <= 223) $i + +;
ElseIf ($value >= 224 && $value <= 239) $i = $i + 2;
ElseIf ($value >= && $value <= 247) $i = $i + 3;
Else die (not a UTF-8 compatible string);
}
$count + +;
}
return $count;
}

Intercept string-utf8 (PHP)
function Utf8_substr ($str, $position, $length) {
$start _position = strlen ($STR);
$start _byte = 0;
$end _position = strlen ($STR);
$count = 0;
for ($i = 0; $i < strlen ($STR); $i + +) {
if ($count >= $position && $start _position > $i) {
$start _position = $i;
$start _byte = $count;
}
if (($count-$start _byte) >= $length) {
$end _position = $i;
Break
}
$value = Ord ($str [$i]);
if ($value > 127) {
$count + +;
if ($value >= 192 && $value <= 223) $i + +;
ElseIf ($value >= 224 && $value <= 239) $i = $i + 2;
ElseIf ($value >= && $value <= 247) $i = $i + 3;
Else die (not a UTF-8 compatible string);
}
$count + +;
}
Return (substr ($str, $start _position, $end _position-$start _position));
}

String length statistics-utf8 [Chinese 3 bytes, Russian, Korean accounted for 2 bytes, 1 bytes in Alphabet] (Ruby)
def utf8_string_length (str)
temp = Cgi::unescape (str)
i = 0;
j = 0;
Temp.length.times{|t|
If TEMP[T] < 127
i + = 1
ElseIf Temp[t] >= 127 and temp[t] < 224
J + = 1
If 0 = = (j% 2)
i + = 2
j = 0
End
Else
J + = 1
If 0 = = (j% 3)
I +=2
j = 0
End
End
}
return I
}

Determine if a Korean-utf-8 (JavaScript) is included
function Checkkoreachar (str) {
for (i=0; i
if (((Str.charcodeat (i) > 0x3130 && str.charcodeat (i) < 0x318f) | | (Str.charcodeat (i) >= 0xac00 && str.charcodeat (i) <= 0xd7a3))) {
return true;
}
}
return false;
}

Determine if there is a Chinese character-gbk (JavaScript)
function Check_chinese_char (s) {
Return (S.length! = S.replace (/[^x00-xff]/g, "* *"). length);
}

http://www.bkjia.com/PHPjc/486508.html www.bkjia.com true http://www.bkjia.com/PHPjc/486508.html techarticle One, the coding range 1. GBK (gb2312/gb18030) x00-xff GBK Double byte encoding range x20-x7f ASCII xa1-xff Chinese x80-xff Chinese 2. UTF-8 (Unicode) u4e00-u9fa5 (Chinese) x3130-x318f (Korean) ...

  • Contact Us

    The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

    If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

    A Free Trial That Lets You Build Big!

    Start building with 50+ products and up to 12 months usage for Elastic Compute Service

    • Sales Support

      1 on 1 presale consultation

    • After-Sales Support

      24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.