PHP

Convert a File's Character Encoding from UTF-8 to UFT-8-BOM

See more HTML-to-XML/Text Examples

To add a utf-8 BOM to a file is just a matter of prepending these 3 bytes to the file: 0xEF 0xBB 0xBF.

This may be difficult in some programming languages, or it may be trivial in either. Therefore, the Chilkat solution you see here might be helpful, or in a language such as C++, the Chilkat solution isn't really necessary because it's easy to do yourself.

Chilkat2 PHP

<?php

use Chilkat2\Charset;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$charset = new Charset();

$charset->FromCharset = 'utf-8';
$charset->ToCharset = 'bom-utf-8';

try {
    $charset->ConvertFile('qa_data/txt/helloWorld.txt', 'qa_output/helloWorldBom.txt');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "Success.\n";