为什么这个排序对我的'change‘值无效?我尝试了许多不同的方法,但仍然无法对其进行排序(也是使用负值)。该脚本在PHP 5.4.16上运行。
$url = 'https://bittrex.com/api/v2.0/pub/Markets/GetMarketSummaries';
$json= file_get_contents($url);
$data = json_decode($json, true);
$items = array();
foreach($data['result'] as $row) {
$base = $row['Market']['BaseCurrency'];
if($base == 'BTC'){
$created = $row['Market']['Created'];
$newDate = date("d-m-Y", strtotime($created));
$last = number_format((float)$row['Summary']['Last'], 8, '.', '');
$prev = number_format((float)$row['Summary']['PrevDay'], 8, '.', '');
$vol = number_format((float)$row['Summary']['BaseVolume'], 2, '.', '');
$name = $row['Market']['MarketCurrencyLong'];
$market = $row['Market']['MarketCurrency'];
$image = $row['Market']['LogoUrl'];
$newName = "$name ($market)";
$change = number_format((float)(1 - $prev / $last) * 100, 2, '.', '');
$items[] = array('name' => $newName, 'change' => $change, 'logo' => $image, 'symb' => $market, 'vol' => $vol, 'date' => $newDate);
}
}
usort($items, function($a, $b) {
return ($b['change']) - ($a['change']);
});
echo '<pre>'; print_r($items); echo '</pre>';
发布于 2018-06-19 05:19:39
将比较函数更改为:
return (float)$b['change'] > (float)$a['change'] ? 1 : ((float)$b['change'] < (float)$a['change'] ? -1 : 0);
如果您使用的是PHP7或更高版本,则可以使用宇宙飞船操作符
return (float)$b['change'] <=> (float)$a['change'];
https://stackoverflow.com/questions/50917490
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