Command line script to run forceutf8 function directly from bash

forceutf8

#!/usr/bin/env php
<?php

require_once("Encoding.php");  // Specify correct path to library here.

if(empty($argv[1])) {
    while($f = fgets(STDIN)){
        echo ForceUTF8\Encoding::toUTF8($f);
    }
} else {
    if(!file_exists($argv[1])){
        if ($argv[1] != "--help") {
            fwrite(STDERR, "File not found.  Use --help for help.\n");
            exit(1);
        }
        echo("Specifiy the file to convert or pipe some text.\n\n");
        echo("Example 1:\n    ls | forceutf8\n\n");
        echo("Example 2:\n    forceutf8 input_file.txt  # will output converted text\n\n");
        echo("Example 3:\n    forceutf8 input_file.txt replace  # will replace file contents\n\n");
        die();
    } else if(!is_file($argv[1])) {
        echo($argv[1]." is a directory.\n");
        exit(2);
    } else {
        $filename = $argv[1];
        echo($filename."\n");
        $file = fopen($filename, "r");
        $output = null;
        if(!empty($argv[2]) && $argv[2] == "replace") {
            $output_filename = $argv[1].".forceutf8";
            $output = fopen($output_filename, "w");
        }

        while($f = fgets($file)){
            if(!is_null($output)) {
                fputs($output, ForceUTF8\Encoding::toUTF8($f));
            } else {
                echo ForceUTF8\Encoding::toUTF8($f);
            }
        }
        fclose($file);
        if(!is_null($output)) fclose($output);
        if(!empty($output_filename)) {
            unlink($filename);
            rename($output_filename, $filename);
        }
    }
}