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php婚配utf-8完整字符，可以防止截取乱码

WBOY
WBOYOriginal
2016-06-13 10:49:49783browse

php匹配utf-8完整字符，可以防止截取乱码

function utf8( $a, $s = '' ){	preg_match_all( '/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/', $a, $d, PREG_PATTERN_ORDER );	return join( $s, $d[0] );}

调用方式
utf8( substr( '截取我', 0, 5 ) );

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