common/helpers/utf8/from_unicode.php - dev - v.bolshakov/AIEcosystem-Testing

common/helpers/utf8/from_unicode.php
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Developer
Initial commit
03 авг 2026, 17:43
03 авг 2026, 17:437433917
<?php

use common\UTF8Exception;

/**
 * Utf8Helper::from_unicode
 */
function _from_unicode($arr)
{
    ob_start();

    $keys = array_keys($arr);

    foreach ($keys as $k) {
        // ASCII range (including control chars)
        if (($arr[$k] >= 0) and ($arr[$k] <= 0x007f)) {
            echo chr($arr[$k]);
        } // 2 byte sequence
        elseif ($arr[$k] <= 0x07ff) {
            echo chr(0xc0 | ($arr[$k] >> 6));
            echo chr(0x80 | ($arr[$k] & 0x003f));
        } // Byte order mark (skip)
        elseif ($arr[$k] == 0xFEFF) {
            // nop -- zap the BOM
        } // Test for illegal surrogates
        elseif ($arr[$k] >= 0xD800 and $arr[$k] <= 0xDFFF) {
            // Found a surrogate
            throw new UTF8Exception("Utf8Helper::from_unicode: Illegal surrogate at index: ':index', value: ':value'",
                array(
                    ':index' => $k,
                    ':value' => $arr[$k],
                ));
        } // 3 byte sequence
        elseif ($arr[$k] <= 0xffff) {
            echo chr(0xe0 | ($arr[$k] >> 12));
            echo chr(0x80 | (($arr[$k] >> 6) & 0x003f));
            echo chr(0x80 | ($arr[$k] & 0x003f));
        } // 4 byte sequence
        elseif ($arr[$k] <= 0x10ffff) {
            echo chr(0xf0 | ($arr[$k] >> 18));
            echo chr(0x80 | (($arr[$k] >> 12) & 0x3f));
            echo chr(0x80 | (($arr[$k] >> 6) & 0x3f));
            echo chr(0x80 | ($arr[$k] & 0x3f));
        } // Out of range
        else {
            throw new UTF8Exception("Utf8Helper::from_unicode: Codepoint out of Unicode range at index: ':index', value: ':value'",
                array(
                    ':index' => $k,
                    ':value' => $arr[$k],
                ));
        }
    }

    $result = ob_get_contents();
    ob_end_clean();

    return $result;
}