復制代碼 代碼如下:

<?php
function smartDetectUTF8($string)
{
static $result = array();
if(! array_key_exists($key = md5($string), $result))
{
$utf8 = "
/^(?:
[/x09/x0A/x0D/x20-/x7E] # ASCII
| [/xC2-/xDF][/x80-/xBF] # non-overlong 2-byte
| /xE0[/xA0-/xBF][/x80-/xBF] # excluding overlongs
| [/xE1-/xEC/xEE/xEF][/x80-/xBF]{2} # straight 3-byte
| /xED[/x80-/x9F][/x80-/xBF] # excluding surrogates
| /xF0[/x90-/xBF][/x80-/xBF]{2} # planes 1-3
| [/xF1-/xF3][/x80-/xBF]{3} # planes 4-15
| /xF4[/x80-/x8F][/x80-/xBF]{2} # plane 16
)+$/xs
";
$result[$key] = preg_match(trim($utf8), $string);
}
return $result[$key];
}
function smartStrlen($string)
{
$result = 0;
$number = smartDetectUTF8($string) ? 3 : 2;
for($i = 0; $i < strlen($string); $i += $bytes)
{
$bytes = ord(substr($string, $i, 1)) > 127 ? $number : 1;
$result += $bytes > 1 ? 1.0 : 0.5;
}
return $result;
}
function smartSubstr($string, $start, $length = null)
{
$result = '';
$number = smartDetectUTF8($string) ? 3 : 2;
if($start < 0)
{
$start = max(smartStrlen($string) + $start, 0);
}
for($i = 0; $i < strlen($string); $i += $bytes)
{
if($start <= 0)
{
break;
}
$bytes = ord(substr($string, $i, 1)) > 127 ? $number : 1;
$start -= $bytes > 1 ? 1.0 : 0.5;
}
if(is_null($length))
{
$result = substr($string, $i);
}
else
{
for($j = $i; $j < strlen($string); $j += $bytes)
{
if($length <= 0)
{
break;
}
if(($bytes = ord(substr($string, $j, 1)) > 127 ? $number : 1) > 1)
{
if($length < 1.0)
{
break;
}
$result .= substr($string, $j, $bytes);
$length -= 1.0;
}
else
{
$result .= substr($string, $j, 1);
$length -= 0.5;
}
}
}
return $result;
}
function smarty_modifier_smartTruncate($string, $length = 80, $etc = '...',
$break_words = false, $middle = false)
{
if ($length == 0)
return '';
if (smartStrlen($string) > $length) {
$length -= smartStrlen($etc);
if (!$break_words && !$middle) {
$string = preg_replace('//s+?(/S+)?$/', '', smartSubstr($string, 0, $length+1));
}
if(!$middle) {
return smartSubstr($string, 0, $length).$etc;
} else {
return smartSubstr($string, 0, $length/2) . $etc . smartSubstr($string, -$length/2);
}
} else {
return $string;
}
}
?>