Multibyte String 函数
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mb_strcut

(PHP 4 >= 4.0.6, PHP 5)

mb_strcut — Get part of string

说明

string mb_strcut ( string $str , int $start [, int $length [, string $encoding ]] )

mb_strcut() extracts a substring from a string similarly to mb_substr(), but operates on bytes instead of characters. If the cut position happens to be between two bytes of a multi-byte character, the cut is performed starting from the first byte of that character. This is also the difference to the substr() function, which would simply cut the string between the bytes and thus result in a malformed byte sequence.

参数

str

The string being cut.

start

Starting position in bytes.

length

Length in bytes.

encoding

encoding 参数为字符编码。如果省略，则使用内部字符编码。

返回值

mb_strcut() returns the portion of str specified by the start and length parameters.

参见

Multibyte String 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Get part of string

用户评论:

php_engineer_bk at yahoo dot com (08-Oct-2010 11:52)

function cut_sense($matne_harf, $l_harf ,$return=1 ) {
if ( strlen($matne_harf) > $l_harf){
$end='...';
}else{
$end='';
}
    if ( function_exists('mb_strcut') ){
        $matne_harf = mb_strcut ( $matne_harf, 0 , $l_harf , "UTF-8" );
    }else{
        $matne_harf =substr($matne_harf, 0, $l_harf);
    }
$text=''.$matne_harf.''.$end.'';
  if ( $return == 1){
  return $text;
  }else{
  print $text;
  }
}

Iranian php programmer (farhad zand +989383015266)

egoalesum at IHATEBOTS dot youarchive dot it (21-May-2009 05:07)

I found this function to be extremely useful.

Here is a practical example, showing the difference between substr(), mb_substr() and mb_strcut():

<?php
mb_internal_encoding('UTF-8');
$string = 'cioèòà';
var_dump(
substr($string, 0, 6),
mb_substr($string, 0, 6),
mb_strcut($string, 0, 6)
);
?>

Output:
string(6) "cioè?"
string(9) "cioèòà"
string(5) "cioè"

Explanation:
$string is long 9 bytes
c - 1 byte
i - 1 byte
o - 1 byte
è - 2 bytes
ò - 2 bytes
à - 2 bytes

substr() works with bytes, so it returns a string which is exactly 6 bytes long. Thus, it truncates the ò character.
mb_substr(), instead, works with characters, so it returns a string which is exactly 6 characters long (but in this case is 9 bytes long).
mb_strcut() works exactly as substr(), but, if the last byte appears to be truncated, it simply omits the character.

When you use
$string = mb_strcut($string, 6);
you can know for sure that strlen($string) <= 6. But no unicode characters will be truncated.

I hope my comment could finally be a simple explanation.

t dot starling at physics dot unimelb dot edu dot au (27-Aug-2004 12:01)

What the manual and the first commenter are trying to say is that mb_strcut uses byte offsets, as opposed to mb_substr which uses character offsets.

Both mb_strcut and mb_substr appear to treat negative and out-of-range offsets and lengths in the basically the same way as substr. An exception is that if start is too large, an empty string will be returned rather than FALSE. Testing indicates that mb_strcut first works out start and end byte offsets, then moves each offset left to the nearest character boundary.

oyag02 at yahoo dot co dot jp (26-Sep-2003 11:53)

diffrence between mb_substr and mb_substr

example:
mb_strcut('I_ROHA', 1, 2) returns 'I_'. Treated as byte stream.
mb_substr('I_ROHA', 1, 2) returns 'ROHA' Treated as character stream.

# 'I_' 'RO' 'HA' means multi-byte character