کد php شمارش حروف یک فایل متنی

[f.sharqi]

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[zinatM]

<?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);
?>