php 中文字符串截取函数

作者：袖梨 2022-06-24

//php教程中文字符串截取函数
/*

*/

代码如下	复制代码
function substr($str = '', $offset = 0, $len = 0){ $len \|\| ($len = strlen($str)); preg_match_all('/./us', $str, $result); return implode('', array_slice($result[0], $offset, $len)); }

//方法二

代码如下

复制代码

if (!function_exists('mb_substr')) {
function mb_substr($str, $start, $len = '', $encoding="utf-8"){
$limit = strlen($str);

  for ($s = 0; $start > 0;--$start) {// found the real start
    if ($s >= $limit)
      break;

    if ($str[$s] <= "")
      ++$s;
    else {
      ++$s; // skip length

      while ($str[$s] >= "€" && $str[$s] <= "�")
        ++$s;
    }
  }

  if ($len == '')
    return substr($str, $s);
  else
    for ($e = $s; $len > 0; --$len) {//found the real end
      if ($e >= $limit)
        break;

      if ($str[$e] <= "")
        ++$e;
      else {
        ++$e;//skip length

        while ($str[$e] >= "€" && $str[$e] <= "�" && $e < $limit)
          ++$e;
      }
    }

return substr($str, $s, $e - $s);
}
}