<?php

/**
* @package utf8
*/

//---------------------------------------------------------------
/**
* UTF-8 aware alternative to ord
* Returns the unicode ordinal for a character
*
* Joomla modification - As of PHP 7.4, curly brace access has been deprecated. As a result this function has been
* modified to use square brace syntax
* See https://github.com/php/php-src/commit/d574df63dc375f5fc9202ce5afde23f866b6450a
* for additional references
*
* @param string UTF-8 encoded character
* @return int unicode ordinal for the character
* @see http://www.php.net/ord
* @see http://www.php.net/manual/en/function.ord.php#46267
*/
function utf8_ord($chr)
{
    $ord0 = ord($chr);

    if ($ord0 >= 0 && $ord0 <= 127) {
        return $ord0;
    }

    if (!isset($chr[1])) {
        trigger_error('Short sequence - at least 2 bytes expected, only 1 seen');
        return false;
    }

    $ord1 = ord($chr[1]);
    if ($ord0 >= 192 && $ord0 <= 223) {
        return ($ord0 - 192) * 64
            + ($ord1 - 128);
    }

    if (!isset($chr[2])) {
        trigger_error('Short sequence - at least 3 bytes expected, only 2 seen');
        return false;
    }
    $ord2 = ord($chr[2]);
    if ($ord0 >= 224 && $ord0 <= 239) {
        return ($ord0 - 224) * 4096
            + ($ord1 - 128) * 64
                + ($ord2 - 128);
    }

    if (!isset($chr[3])) {
        trigger_error('Short sequence - at least 4 bytes expected, only 3 seen');
        return false;
    }
    $ord3 = ord($chr[3]);
    if ($ord0 >= 240 && $ord0 <= 247) {
        return ($ord0 - 240) * 262144
            + ($ord1 - 128) * 4096
                + ($ord2 - 128) * 64
                    + ($ord3 - 128);
    }

    if (!isset($chr[4])) {
        trigger_error('Short sequence - at least 5 bytes expected, only 4 seen');
        return false;
    }
    $ord4 = ord($chr[4]);
    if ($ord0 >= 248 && $ord0 <= 251) {
        return ($ord0 - 248) * 16777216
            + ($ord1 - 128) * 262144
                + ($ord2 - 128) * 4096
                    + ($ord3 - 128) * 64
                        + ($ord4 - 128);
    }

    if (!isset($chr[5])) {
        trigger_error('Short sequence - at least 6 bytes expected, only 5 seen');
        return false;
    }
    if ($ord0 >= 252 && $ord0 <= 253) {
        return ($ord0 - 252) * 1073741824
            + ($ord1 - 128) * 16777216
                + ($ord2 - 128) * 262144
                    + ($ord3 - 128) * 4096
                        + ($ord4 - 128) * 64
                            + (ord($chr[5]) - 128);
    }

    if ($ord0 >= 254 && $ord0 <= 255) {
        trigger_error('Invalid UTF-8 with surrogate ordinal ' . $ord0);
        return false;
    }
}
