php批量修改数组的值,php批量给手机号数组加86

需求：微信小程序短信，批量发送，需要给手机号前面加上+86，数据库中查出所有手机号数组，批量加+86

1,foreach

$array = array('15012341231','15012341232','15012341234');
foreach ($array as $key => $value) {
    $array[$key] = '+86'.$value;
}
print_r($array);

$array = array('15012341231','15012341232','15012341234');
$new_array = array_map('add86', $array);
print_r($new_array);

function add86($val){
    return '+86'.$val;
}

$array = array('15012341231','15012341232','15012341234');
array_walk($array, 'add86_2');
print_r($array);
function add86_2(&$value, $key){
    $value = '+86'.$value;
}