如何使用 PHP 检查数组是否为空?

How to check whether an array is empty using PHP?(如何使用 PHP 检查数组是否为空?)

问题描述

players 将为空或以逗号分隔的列表(或单个值).检查它是否为空的最简单方法是什么?我假设我可以在将 $gameresult 数组获取到 $gamerow 后立即这样做?在这种情况下，如果 $playerlist 为空，则跳过爆炸可能会更有效，但为了论证，我将如何检查数组是否也为空?

players will either be empty or a comma separated list (or a single value). What is the easiest way to check if it's empty? I'm assuming I can do so as soon as I fetch the $gameresult array into $gamerow? In this case it would probably be more efficient to skip exploding the $playerlist if it's empty, but for the sake of argument, how would I check if an array is empty as well?

$gamerow = mysql_fetch_array($gameresult);
$playerlist = explode(",", $gamerow['players']);

推荐答案

如果只需要检查数组中是否有ANY元素

If you just need to check if there are ANY elements in the array

if (empty($playerlist)) {
     // list is empty.
}

如果您需要在检查前清除空值(通常这样做是为了防止 explode 处理奇怪的字符串):

If you need to clean out empty values before checking (generally done to prevent explodeing weird strings):

foreach ($playerlist as $key => $value) {
    if (empty($value)) {
       unset($playerlist[$key]);
    }
}
if (empty($playerlist)) {
   //empty array
}

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