截取字符串长度(不区分中英文字符长度)
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2022-05-14 09:58:38
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static function tran($string,$length=0,$str='',$etc='...'){ $result = ''; $string = html_entity_decode(trim(strip_tags($string)), ENT_QUOTES, 'utf-8'); for($i = 0, $j = 0; $i < strlen($string); $i++) { if($j >= $length) { for($x = 0, $y = 0; $x < strlen($etc); $x++) { if($number = strpos(str_pad(decbin(ord(substr($string, $i, 1))), 8, '0', STR_PAD_LEFT), '0')) { $x += $number - 1; $y++; } else { $y += 0.5; } } $length -= $y; break; } if($number = strpos(str_pad(decbin(ord(substr($string, $i, 1))), 8, '0', STR_PAD_LEFT), '0')) { $i += $number - 1; $j++; } else { $j += 0.5; } } for($i = 0; (($i < strlen($string)) && ($length > 0)); $i++) { if($number = strpos(str_pad(decbin(ord(substr($string, $i, 1))), 8, '0', STR_PAD_LEFT), '0')) { if($length < 1.0) { break; } $result .= substr($string, $i, $number); $length -= 1.0; $i += $number - 1; } else { $result .= substr($string, $i, 1); $length -= 0.5; } } $result = htmlentities($result, ENT_QUOTES, 'utf-8'); if($i < strlen($string)) { $result .= $etc; } if(!empty($str)){ return $result; } else{ echo $result; } } }
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