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substr加强版,可截取中文字符

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Release: 2016-05-26 08:18:38
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substr加强版,可截取中文字符

/*
substr加强版,可截取中文字符,

*/

function subistr($str,$start,$end){
	$reslut = '';
	for($i=$start ; $i<=$end ; $i++){
		if(preg_match(&#39;/[\x7f-\xff]/&#39;,$str[$i]) ){
			$reslut .= $str[$i].$str[$i+1].$str[$i+2];
			$i = $i+2;
			$end = $end+2;
		}else{
			$reslut .= $str[$i];
		}
	}
	return $reslut?$reslut:false;
}

$ch = &#39;0as这ss是带中文的测dd试bnb&#39;;
var_dump(subistr($ch,0,7));

//string &#39;0as这ss是带&#39; (length=14)
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