PHP で Unicode コードポイントから文字を取得するにはどうすればよいですか?

<code class="php">header('Content-Encoding: UTF-8');

function mb_html_entity_decode($string)
{
    // ... Encoding conversion and decoding logic
}

function mb_ord($string)
{
    // ... UTF-8 to UCS-4BE conversion and unpacking
}

function mb_chr($string)
{
    // ... HTML entity encoding and decoding
}

// Example: Getting the character for U+010F

$codePoint = hexdec('010F');
print mb_chr($codePoint); // Outputs ó</code>

<code class="php">$codePoint = 243;
print mb_ord('ó'); // Outputs 243
print mb_chr(243); // Outputs ó</code>