PHP中英文混合无乱码截取
$length){
$str='';
$len=$start+$length;
$i = $start;
while($i<$len){
if(ord(substr($string, $i, 1))>=128){
$str.=substr($string, $i, 3);
$i = $i+ 3;
}else{
$str.=substr($string, $i, 1);
$i ++;
}
}
return $str;
}else{
return $string;
}
}
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