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read and break file into words, divide by certain number and output to new files

TonyHull asked
Last Modified: 2012-05-05
I am trying to import a text file and export it into smaller files. For example, I have a txt file with 88 words, I want it to be broken down into 5 files. It does work but it keeps adding the previous words to each consequtive file.
So if file 1.txt has 18 words, file 2.txt should have words 19 to 36, file 3.txt 37 to 54. Instead it adds file 2 to file one then file three to 2 and 1.
Can anyone fix this or write it more elegantly??

$numWords = 88;
$count = 5;

$k = 0;
      $increment = $numWords;
      $j_increment = 0;
       while($k < $count) {
              for($j=$j_increment ; $j < $increment; $j++)
         if (eregi("[0-9A-Za-zÀ-ÖØ-öø-ÿ]", $arrayNew[$j]))
                    $newFile.=$arrayNew[$j] . ' ';
             $newFileNum = $fileAddress.(($k + 1) . '.txt');
             if (!$fh = fopen($newFileNum,"a")) { echo "Cannot open file"; }  
            if (!fwrite($fh, $newFile)) { echo "Cannot write to file"; }  
            echo "You have successfully written data to $newFileNum";  
       $increment += $numWords;
       $j_increment += $numWords;
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