Question

我试图回显一个数组，在该数组中我想将实际数字与上一个进行比较。结果以％为单位。如果当前字体与前一个字体之间的百分比差异大于10％，我想将字体涂成红色。

不幸的是，我的整个结果将变成红色，而且我不知道在哪里可以放置10％的差异。

<?php
#Difference_Query
$Difference_Query = "SELECT (SUM(current) * 100) / ((SUM(cw_1) + SUM(cw_2)) / 2) AS Diff FROM table GROUP BY time";
$Difference = mysqli_query($connect, $Difference_Query);

$previous = 0;
foreach($Difference as $result) {
    if($previous > $result['Diff']) {
        echo "<font color = 'red'>".number_format($result['Diff'], 2, ",", ".")."%"."</font>"."<br>";
    } else {
        echo number_format($result['Diff'], 2, ",", "."), "%", "<br>";
    }
    $previous = $result['Diff'];
}?>

当前视觉效果：

159,09% (red)
196,17% (red)
196,67% (red)
188,56%
188,41%
181,55%
178,15%
175,74%
183,03% (red)
193,31% (red)
224,28% (red)
230,28% (red)

Answer 1

有些事情似乎不是正确的方法，甚至在您的代码中也不正确。尝试使用此方法，如果遇到问题，请不要犹豫，我会尝试进行更新。

_通常，从查询结果中提取行的最佳方法是使用为此专门设计的函数，例如mysqli_fetch_assoc（它将使用别名或列名作为数组的键）< / p>

_ {implode从理论上讲如果$result['Diff']是一个int（实际上您想要一个int），甚至会引发错误，那么在理论上就没用了

_不清楚您是否希望先前值与当前值之间的差是10，或当前值的10％。该示例显示了第一个

 <?php
$Difference_Query = "SELECT (SUM(current) * 100) / ((SUM(cw_1) + SUM(cw_2)) / 2) AS Diff FROM table GROUP BY time";
$Difference = mysqli_query($connect, $Difference_Query);

$previous = 0;
while($result = mysqli_fetch_assoc($Difference)) {
    //abs is in case results are not in ascending order; this if will test if current is more than previous+10 or less than previous-10
    if(abs($result['Diff'] - $previous) > 10) {
        echo "<font color = 'red'>".number_format($result['Diff'], 2, ",", ".")."%"."</font>"."<br>";
    } else {
         echo number_format($result['Diff'], 2, ",", "."), "%", "<br>";
    }
    $previous = $result['Diff'];
}
?>

将结果与先前的结果进行比较，如果差Y，则进行X

1 个答案: