PHP截取中文字符串
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<?php //一个汉字占两个字母字节大小 $str='我们在盘下建立资料夹在依照不同浏览器对应到不同的子目路以为例我们将资料夹对'; echo strlen($str),','; //出现乱码 $s=substr($str,9); echo $s,"\r\n"; $s=cn_substr($str,9); echo $s,"\r\n"; //这样就没有乱码 $s=substr($str,10); echo $s,"\r\n"; $s=' Cache IE9 , , , D'; echo strlen($s); function cn_substr($title,$start,$len="",$magic=true) { $length = 0; if($len == "") $len = strlen($title); //判断起始为不正确位置 if($start > 0) { $cnum = 0; for($i=0;$i<$start;$i++) { if(ord(substr($title,$i,1)) >= 128) $cnum ++; } if($cnum%2 != 0) $start--; unset($cnum); } if(strlen($title)<=$len) return substr($title,$start,$len); $alen = 0; $blen = 0; $realnum = 0; for($i=$start;$i<strlen($title);$i++) { $ctype = 0; $cstep = 0; $cur = substr($title,$i,1); if($cur == "&") { if(substr($title,$i,4) == "<") { $cstep = 4; $length += 4; $i += 3; $realnum ++; if($magic) { $alen ++; } } else if(substr($title,$i,4) == ">") { $cstep = 4; $length += 4; $i += 3; $realnum ++; if($magic) { $alen ++; } } else if(substr($title,$i,5) == "&") { $cstep = 5; $length += 5; $i += 4; $realnum ++; if($magic) { $alen ++; } } else if(substr($title,$i,6) == """) { $cstep = 6; $length += 6; $i += 5; $realnum ++; if($magic) { $alen ++; } } else if(substr($title,$i,6) == "'") { $cstep = 6; $length += 6; $i += 5; $realnum ++; if($magic) { $alen ++; } } else if(preg_match("/&#(\d+);/i",substr($title,$i,8),$match)) { $cstep = strlen($match[0]); $length += strlen($match[0]); $i += strlen($match[0])-1; $realnum ++; if($magic) { $blen ++; $ctype = 1; } } }else{ if(ord($cur)>=128) { $cstep = 2; $length += 2; $i += 1; $realnum ++; if($magic) { $blen ++; $ctype = 1; } }else{ $cstep = 1; $length +=1; $realnum ++; if($magic) { $alen++; } } } if($magic) { if(($blen*2+$alen) == ($len*2)) break; if(($blen*2+$alen) == ($len*2+1)) { if($ctype == 1) { $length -= $cstep; break; }else{ break; } } }else{ if($realnum == $len) break; } } return substr($title,$start,$length); } 该文章在 2012/4/3 22:46:58 编辑过 |
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