کد php شمارش حروف یک فایل متنی

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<?php

    $myfile = fopen("file.txt", "r") or die("Unable to open file!");

    $file_text = fread($myfile,filesize("file.txt"));

    $remove = array("\n", "\r\n", "\r", "\t");

    $file_text = str_replace($remove, ' ', $file_text);

    $array_letters = array_map('trim',array_filter(explode(' ',$file_text)));

    print count($array_letters);

    fclose($myfile);

?>