Laravel从数据库中查找数据，直到它为空或重试完成

Question

in my web application i want to search in database and when that is null i should store new data, for checking this operation i'm using do while statement with another option to check and search from database with limit period as retry, like with this code:

$retry = 0;
do {
    $feed = $feeds[array_rand($feeds)];
    $history = InstagramActionsHistory::wherePk($feed->pk)->whereActionName('comment')->first();
    $retry++;
} while ($history == null || $retry >= 3);

in this code while when $history is null or $retry is bigger than or equals with 3 statement should be break, but it doesn't work correctly

instead of that this code work correctly:

$retry = 0;
do {
    $feed = $feeds[array_rand($feeds)];
    $history = InstagramActionsHistory::wherePk($feed->pk)->whereActionName('comment')->first();
    $retry++;
    if ($history == null || $retry >= 3) {
        break;
    }
} while (true);

it seems multi condition dont work in while statement

Answer 1

You should use logical operator.

http://php.net/manual/en/language.operators.logical.php

Modified code

<?php 
$retry = 0;
do {
        $feed = $feeds[array_rand($feeds)];
        $history = InstagramActionsHistory::wherePk($feed->pk)->whereActionName('comment')->first();
        $retry++;
} while ($history && $retry >= 3);
?>