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鸽子
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849天前<?php |
//http://blog.1dnet.net |
//$str 待截取的字符串 |
//$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); |
?> |
