如何判断一个PHP数组是空的？ [英] How to tell if a PHP array is empty?

问题描述

玩家要么是空的，或者一个逗号分隔的列表（或单个值）。什么是检查它是否是空的最简单的方法？我假设我可以这样，只要我取 $ gameresult 数组 $ gamerow 吗？在这种情况下，它可能会更有效地跳过爆炸的 $ playerlist 如果它是空的，但对于论证起见，我将如何检查是否一个数组是空的，以及？

players will either be empty or a comma seperated 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']);

谢谢！

推荐答案

如果你只需要检查是否有数组中的任何元素

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

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

如果你需要检查之前清理出空值（一般做prevent 爆炸 ING怪异的字符串）：

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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