php - fseek() : stream does not support seeking

Question

读取.txt文件并获取文本文件的最后一行，我使用的函数在下面注释

function read_last_line (){

      $line = '';
      
      $f = fopen('localpath\data.txt', 'r');
      $cursor = -1;
      
      fseek($f, $cursor, SEEK_END);
      $char = fgetc($f);
      
      /**
       * Trim trailing newline chars of the file
       */
      while ($char === "\n" || $char === "\r") {
          fseek($f, $cursor--, SEEK_END);
          $char = fgetc($f);
      }
      
      /**
       * Read until the start of the file or first newline char
       */
      while ($char !== false && $char !== "\n" && $char !== "\r") {
          /**
           * Prepend the new char
           */
          $line = $char . $line;
          fseek($f, $cursor--, SEEK_END);
          $char = fgetc($f);
      }      
      echo $line;
      }

在执行上述代码时，我得到fseek(): Stream does not supportlooking，需要一个解决方案来解决该问题。

Answer 1

不支持所有形式的查找，并且在某些情况下会失败。

更多详细信息请查看文档 https://www.php.net/manual/en/function.fseek.php