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PHP string interception Chinese interception 2, single byte interception mode_PHP tutorial
- WBOYOriginal
- 2016-07-21 15:54:06701browse
//中文截取2，单字节截取模式
function cn_substr($str,$slen,$startdd=0){
$restr = "";
$c = "";
$str_len = strlen($str);
if($str_len < $startdd+1) return "";
if($str_len < $startdd + $slen || $slen==0) $slen = $str_len - $startdd;
$enddd = $startdd + $slen - 1;
for($i=0;$i<$str_len;$i++)
{
if($startdd==0) $restr .= $c;
else if($i > $startdd) $restr .= $c;
if(ord($str[$i])>0x80){
if($str_len>$i+1) $c = $str[$i].$str[$i+1];
$i++;
}
else{ $c = $str[$i]; }
if($i >= $enddd){
if(strlen($restr)+strlen($c)>$slen) break;
else{ $restr .= $c; break; }
}
}
return $restr;
}
function cn_midstr($str,$start,$len){
return cn_substr($str,$slen,$startdd);
}