How Can I Remove Multiple UTF-8 BOM Sequences from PHP-Generated HTML?

Removing Multiple UTF-8 BOM Sequences

When generating HTML templates using PHP5 (CGI), encountering issues with raw HTML output may be due to the presence of multiple UTF-8 Byte Order Marks (BOMs). To resolve this, consider implementing the following strategies:

Using a Regular Expression

One method is to employ a regular expression to remove the BOMs. By utilizing the code below, you can effectively eliminate all instances of BOMs from your text:

function remove_utf8_bom($text)
{
    $bom = pack('H*','EFBBBF');
    $text = preg_replace("/^$bom/", '', $text);
    return $text;
}

Custom Byte Removal

Alternatively, you could manually remove the BOMs by examining the first three bytes of the input text and eliminating them if they match the UTF-8 BOM sequence. The following code snippet demonstrates this approach:

if (substr($t, 0, 3) == b'\xef\xbb\xbf') {
    $t = substr($t, 3);
}

By implementing one of these techniques, you should be able to successfully remove any excess UTF-8 BOMs and ensure the proper display of your HTML templates in Firefox.

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