本文实例讲述了php按字符无乱码截取中文的方法。分享给大家供大家参考。具体实现方法如下：

<?php//$str 待截取的字符串//$len 截取的字符个数//$chars 已经截取的字符数//$res 保存的字符串//$chars 保存已经截取的字符串个数//$offset 截取的偏移量//$length 字符串的字节数//若$len>$str的字符个数，造成无谓的while循环，($offset<$length限定)function utf8sub($str,$len){ if($len<=0){ return ; } $res=""; $offset=0; $chars=0; $length=strlen($str); while($chars<$len && $offset<$length){ $hign=decbin(ord(substr($str,$offset,1))); if(strlen($hign)<8){ $count=1; }elseif(substr($hign,0,3)=="110"){ $count=2; }elseif(substr($hign,0,4)=="1110"){ $count=3; }elseif(substr($hign,0,5)=="11110"){ $count=4; }elseif(substr($hign,0,6)=="111110"){ $count=5; }elseif(substr($hign,0,7)=="1111110"){ $count=6; } $res.=substr($str,$offset,$count); $offset+=$count; $chars+=1; } return $res;}function utf8sub1($str,$len){ $chars=0; $res=""; $offset=0; $length=strlen($str); while($chars<$len && $offset<$length){ $hign=decbin(ord(substr($str,$offset,1))); if(strlen($hign)<8){ $count=1; }elseif($hign & "11100000"=="11000000"){ $count=2; }elseif($hign & "11110000"=="11100000"){ $count=3; }elseif($hign & "11111000"=="11110000"){ $count=4; }elseif($hign & "11111100"=="11111000"){ $count=5; }elseif($hign & "11111110"=="11111100"){ $count=6; } $res.=substr($str,$offset,$count); $chars++; $offset+=$count; } return $res;}$a="中华ah人民hdj";echo utf8sub($a,5);?>

希望本文所述对大家的php程序设计有所帮助。