php按字符无乱码截取中文的方法
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<$length限定) functionutf8sub($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; } functionutf8sub1($str,$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; } $a="中华ah人民hdj"; echoutf8sub($a,5); ?>
希望本文所述对大家的php程序设计有所帮助。