test

<?php

function a(string $str): bool {
    preg_match_all('/[1]{1,}/', $str, $match1);
    preg_match_all('/[0]{1,}/', $str, $match0);

    sort($match1[0], SORT_STRING);
    sort($match0[0], SORT_STRING);

    return mb_strlen(array_reverse($match1[0])[0] ?? '') > mb_strlen(array_reverse($match0[0])[0] ?? '');
}

var_dump(a('1010')); // false

var_dump(a('1010111000100011111')); // true

var_dump(a('100')); // false