PHP截取各种编码的汉字字符串

01

<?php

02

//截取中文字符串-

03

function

mysubstr(

$str

,

$start

,

$len

)
{

04

$tmpstr

=

""

;

05

$strlen

=

$start

+

$len

;

06

for

(

$i

=
0;

$i

<

$strlen

;

$i

++)
{

07

if

(ord(

substr

(

$str

,

$i

,
1))>0xa0){

08

$tmpstr

.=

substr

(

$str

,

$i

,
2);

09

$i

++;

10

}

else

11

$tmpstr

.=

substr

(

$str

,

$i

,
1);

12

}

13

return

$tmpstr

;

14

}

15

?>

1

<?php

2

//截取utf8字符串

3

function

utf8Substr(

$str

,

$from

,

$len

)

4

{

5

return

preg_replace(

'#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'

.

$from

.

'}'

.

6

'((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'

.

$len

.

'}).*#s'

,

7

'$1'

,

$str

);

8

}

9

?>

01

<?php

02

/*

03

Utf-8、gb2312都支持的汉字截取函数

04

cut_str(字符串,
截取长度,开始长度,编码);

05

编码默认为
utf-8

06

开始长度默认为
0

07

*/

function

cut_str(

$string

,

$sublen

,

$start

=
0,

$code

=

'UTF-8'

)

08

{

09

if

(

$code

==

'UTF-8'

)

10

{

11

$pa

=

"/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/"

;

12

preg_match_all(

$pa

,

$string

,

$t_string

);

if

(

count

(

$t_string

[0])
-

$start

>

$sublen

)

return

join(

''

,

array_slice

(

$t_string

[0],

$start

,

$sublen

)).

"..."

;

13

return

join(

''

,

array_slice

(

$t_string

[0],

$start

,

$sublen

));

14

}

15

else

16

{

17

$start

=

$start

*2;

18

$sublen

=

$sublen

*2;

19

$strlen

=

strlen

(

$string

);

20

$tmpstr

=

''

;

for

(

$i

=0;

$i

<

$strlen

;

$i

++)

21

{

22

if

(

$i

>=

$start

&&

$i

<(

$start

+

$sublen

))

23

{

24

if

(ord(

substr

(

$string

,

$i

,
1))>129)

25

{

26

$tmpstr

.=

substr

(

$string

,

$i

,
2);

27

}

28

else

29

{

30

$tmpstr

.=

substr

(

$string

,

$i

,
1);

31

}

32

}

33

if

(ord(

substr

(

$string

,

$i

,
1))>129)

$i

++;

34

}

35

if

(

strlen

(

$tmpstr

)<

$strlen

)

$tmpstr

.=

"..."

;

36

return

$tmpstr

;

37

}

38

}

$str

=

"abcd需要截取的字符串"

;

39

echo

cut_str(

$str

,
8,0,

'gb2312'

);

40

?>

01

<?php

02

/**

03

*
@package BugFree

04

*
@version $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $

05

*

06

*

07

*
Return part of a string(Enhance the function substr())

08

*

09

*
@author  Chunsheng Wang <[email]wwccss@263.net[/email]>

10

*
@param string $String the string to cut.

11

*
@param int $Length the length of returned string.

12

*
@param booble $Append whether append "...": false|true

13

*
@return string   the cutted string.

14

*/

15

function

sysSubStr(

$String

,

$Length

,

$Append

=
false)

16

{

17

if

(

strlen

(

$String

)
<=

$Length

)

18

{

19

return

$String

;

20

}

21

else

22

{

23

$I

=
0;

24

while

(

$I

<

$Length

)

25

{

26

$StringTMP

=

substr

(

$String

,

$I

,1);

27

if

(
ord(

$StringTMP

)
>=224 )

28

{

29

$StringTMP

=

substr

(

$String

,

$I

,3);

30

$I

=

$I

+
3;

31

}

32

elseif

(
ord(

$StringTMP

)
>=192 )

33

{

34

$StringTMP

=

substr

(

$String

,

$I

,2);

35

$I

=

$I

+
2;

36

}

37

else

38

{

39

$I

=

$I

+
1;

40

}

41

$StringLast

[]
=

$StringTMP

;

42

}

43

$StringLast

=
implode(

""

,

$StringLast

);

44

if

(

$Append

)

45

{

46

$StringLast

.=

"..."

;

47

}

48

return

$StringLast

;

49

}

50

}

$String

=

"www.at0915.cn"

;

51

$Length

=

"18"

;

52

$Append

=
false;

53

echo

sysSubStr(

$String

,

$Length

,

$Append

);

54

?>