php utf8編碼字符串的截取
阿新 • • 發佈:2019-02-28
substr 如果 大於 ret trim exist new subst else
function sub_str($str, $length = 0, $append = true) { $str = trim($str); $strlength = strlen($str); if ($length == 0 || $length >= $strlength) { return $str; //截取長度等於0或大於等於本字符串的長度,返回字符串本身 } elseif ($length < 0) //如果截取長度為負數 { $length = $strlength+ $length;//那麽截取長度就等於字符串長度減去截取長度 if ($length < 0) { $length = $strlength;//如果截取長度的絕對值大於字符串本身長度,則截取長度取字符串本身的長度 } } if (function_exists(‘mb_substr‘)) { $newstr = mb_substr($str, 0, $length, EC_CHARSET); } elseif (function_exists(‘iconv_substr‘)) { $newstr = iconv_substr($str, 0, $length, EC_CHARSET); } else { //$newstr = trim_right(substr($str, 0, $length)); $newstr = substr($str, 0, $length); } if ($append && $str != $newstr) { $newstr .= ‘...‘; }return $newstr; }
php utf8編碼字符串的截取