php字串截取函數_PHP教程

php教程字串截取函數
在php中有一款字串截取函數substr但這款函數，只能截取英文不支援中文與其

它的混體，下面我們提供了三款函數，它們可以支援中英文混合體。

function syssubstr($string,$length,$append = false)
{
if (strlen($string) < = $length )
{
return $string;
}
else
{
$i = 0;
while ($i < $length)
{
$stringtmp = substr($string,$i,1);
if ( ord($stringtmp) >=224 )
{
$stringtmp = substr($string,$i,3);
$i = $i + 3;
}
elseif( ord($stringtmp) >=192 )
{
$stringtmp = substr($string,$i,2);
$i = $i + 2;
}
else
{
$i = $i + 1;
}
$stringlast[] = $stringtmp;
}
$stringlast = implode("",$stringlast);
if($append)
{
$stringlast .= "...";
}
return $stringlast;
}
}

$string = "";
$length = "18";
$append = false;
echo syssubstr($string,$length,$append);

字串截取函數二

function cut_str($string,$sublen,$start=0,$code='utf-8')
{
if($code=='utf-8')
{
$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]/";
preg_match_all($pa,$string,$t_string);

if(count($t_string[0])-$start>$sublen) return join('',array_slice

($t_string[0],$start,$sublen))."...";
return join('',array_slice($t_string[0],$start,$sublen));
}
else
{
$start=$start*2;
$sublen=$sublen*2;
$strlen=strlen($string);
$tmps教程tr='';

for($i=0;$i<$strlen;$i++)
{
if($i>=$start&&$i<($start+$sublen))
{
if(ord(substr($string,$i,1))>129)
{
$tmpstr.=substr($string,$i,2);
}
else
{
$tmpstr.=substr($string,$i,1);
}
}
if(ord(substr($string,$i,1))>129) $i++;
}
if(strlen($tmpstr)<$strlen ) $tmpstr.="...";
return $tmpstr;
}
}

$str="新程php培訓";
echo cut_str($str,8,0,'gb2312');

函數三

//截取utf8字串
function utf8substr($str, $from, $len)
{
return preg_replace('#^(?:[x00-x7f]|[xc0-xff][x80-xbf]+)

{0,'.$from.'}'.
'((?:[x00-x7f]|[xc0-xff][x80-xbf]+){0,'.$len.'}).*#s',
'$1',$str);
}
?>

上面三款函數都很好對中文字元等進行截取了，好了不說多了這些都是來自於網路

。

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