我想計算文本文件中的單詞數。下面是我嘗試過的代碼。php 代碼工作正常，但它也計算空白。我應該添加什么才能使代碼不計算空格。我的PHP代碼：<?php $count = 0;  //Opens a file in read mode  $file = fopen("trial.txt", "r");  //Gets each line till end of file is reached  while (($line = fgets($file)) !== false) {      //Splits each line into words      $words = explode(" ", $line);      //Counts each word      $count = $count + count($words);  }  print("Number of words : " . $count);  fclose($file);?>