PHP Mb_strwidth in the actual use of the problem analysis _php tutorial

A recent PHP Web site project News section needs a feature to intercept the string according to the width of the title and add "..." at the end, the first thought is the use of PHP mb_ string function Implementation, Mb_strimwidth,mb_strwidth, after the discovery if the title exists "" Symbol, PHP Mb_strwidth will think of the symbol is 1 width, I wonder if this is not Chinese double quotation marks, it is supposed to be wide-byte, length should be 2 width, after query "" Unicode respectively is u201c and u201d, not in the range of characters, Then query the unicode.org Code table, found that u2000-u206f is a universal symbol of the range, the characters in this range, although all the form of wide characters, but PHP mb_ function is considered to be 1 width, no way, only on their own.

The following are the implemented functions:

 
 

  
  

  
function truncstring ($STR, $length)
  
  

  
{
  
  

  
$ Countlen = 0 ; 
  
  

  
for ($i=0; $i<Mb_strlen($STR); $ i++)
  
  

  
{
  
  

  
$countLen +=amb_strwidth (Mb_substr ($str, $i, 1));
  
  

  
if ($countLen>$length)
  
  

  
Return Mb_substr ($str, 0, $i);
  
  

  
}
  
  

  
return $str;
  
  

  
}
  
  

  
function Amb_strwidth ($str _width)
  
  

  
{
  
  

  
$ Count = 0 ; 
  
  

  
for ($i=0; $i<Mb_strlen($ Str_width), $i + +)
  
  

  
{
  
  

  
if (Mb_substr ($str _width, $i, 1) = = "Xe2x80x9c" | | Mb_substr ($str _width, $i, 1) = = ' xe2x80x9d ')
  
  

  
Add 2 to the counter if you encounter characters in u2000-u206f
  
  

  
if (Preg_match ("/[x{2000}-x{206f}]/u", Mb_substr ($str _width, $i, 1)))
  
  

  
$count +=2;
  
  

  
Else
  
  

  
$count +=mb_strwidth (Mb_substr ($str _width, $i, 1));
  
  

  
}
  
  

  
return $count;
  
  

  
}
 
 

The above is the use of PHP mb_strwidth when the problem of the specific solution, I hope to play a role in helping people.

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