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<?php

if (!is_callable('RandomCompat_strlen')) {
    if (defined('MB_OVERLOAD_STRING') && ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING) {
        function RandomCompat_strlen($binary_string)
        {
            if (!is_string($binary_string)) {
                throw new TypeError('RandomCompat_strlen() expects a string');
            }
            return (int) mb_strlen($binary_string, '8bit');
        }
    } else {
        function RandomCompat_strlen($binary_string)
        {
            if (!is_string($binary_string)) {
                throw new TypeError('RandomCompat_strlen() expects a string');
            }
            return (int) strlen($binary_string);
        }
    }
}
if (!is_callable('RandomCompat_substr')) {
    if (defined('MB_OVERLOAD_STRING') && ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING) {
        function RandomCompat_substr($binary_string, $start, $length = null)
        {
            if (!is_string($binary_string)) {
                throw new TypeError('RandomCompat_substr(): First argument should be a string');
            }
            if (!is_int($start)) {
                throw new TypeError('RandomCompat_substr(): Second argument should be an integer');
            }
            if ($length === null) {
                $length = RandomCompat_strlen($binary_string) - $start;
            } elseif (!is_int($length)) {
                throw new TypeError('RandomCompat_substr(): Third argument should be an integer, or omitted');
            }
            if ($start === RandomCompat_strlen($binary_string) && $length === 0) {
                return '';
            }
            if ($start > RandomCompat_strlen($binary_string)) {
                return '';
            }
            return (string) mb_substr($binary_string, $start, $length, '8bit');
        }
    } else {
        function RandomCompat_substr($binary_string, $start, $length = null)
        {
            if (!is_string($binary_string)) {
                throw new TypeError('RandomCompat_substr(): First argument should be a string');
            }
            if (!is_int($start)) {
                throw new TypeError('RandomCompat_substr(): Second argument should be an integer');
            }
            if ($length !== null) {
                if (!is_int($length)) {
                    throw new TypeError('RandomCompat_substr(): Third argument should be an integer, or omitted');
                }
                return (string) substr($binary_string, $start, $length);
            }
            return (string) substr($binary_string, $start);
        }
    }
}