Remove BOM from a given file. Includes error checking.

rmbom.php

<?php
/**
 * A simple script to remove BOM from a given file.
 *
 * @author Jeremy Pry
 */

if ( $argc < 2 ) {
	echo "Please include a file to operate on!" . PHP_EOL;
	die( 1 );
}

$file = $argv[1];

if ( ! file_exists( $file ) ) {
	echo "File [{$file}] does not exist!" . PHP_EOL;
	die( 2 );
}

if ( ! is_writable( $file ) ) {
	echo "Cannot write to file [{$file}]" . PHP_EOL;
	die( 3 );
}

if ( is_dir( $file ) ) {
	echo "[{$file}] is a directory!" . PHP_EOL;
	die(4);
}

file_put_contents( $file, str_replace( "\xef\xbb\xbf", '', file_get_contents( $file ) ) );