[英]PHP usort() or Carbon returns incorrectly sorted array
I have a project that is using Google Charts Line Graph API to generate a graph of Date vs Number. 我有一个项目正在使用Google Charts Line Graph API生成日期与数字的图表。
I am delivering an array from a PHP script via Ajax to the Google Chart. 我正在通过Ajax从PHP脚本向Google Chart提供数组。
That all works, however there are occasionally ... oddities... in the data, in that Google Charts appears to loop-back over itself. 一切正常,但是在数据中偶尔会出现...奇怪的地方,因为Google图表似乎在自身上产生了环回。
I think this is because Google Charts relies on the order of the JSON array it receives (regardless of Dates). 我认为这是因为Google图表依赖于其接收的JSON数组的顺序(无论日期如何)。 So I am trying to sort this array by Date before I send it in PHP.
因此,在将其发送到PHP中之前,我试图按日期对该数组进行排序。 I am using a function inside usort() to achieve this, and using the Carbon extension to compare dates.
我在usort()内部使用一个函数来实现此目的,并使用Carbon扩展名比较日期。
// Sort by Date
usort(
$rows,
function ($a, $b) {
// 'date' Index in $row array
$date = 0;
// Match for anything within Brackets (only match should be 'Date(xxx)' column of $row);
preg_match('#\((.*?)\)#', $a[$date], $a_matches);
preg_match('#\((.*?)\)#', $b[$date], $b_matches);
// If $a and $b contain Dates (as assumed by above) ie. not header/information rows
if (isset($a_matches[1]) && isset($b_matches[1])) {
// Convert the strings to Dates and increase
$a_date = Carbon::parse(str_replace(', ', '-', $a_matches[1]))->addMonth();
$b_date = Carbon::parse(str_replace(', ', '-', $b_matches[1]))->addMonth();
// If $a less than $b, return -1 (reduce $a in order) otherwise 1 (promote $a in order)
if ($a_date->lt($b_date)) return -1;
else return 1;
}
// Else return 0 (no change in order)
return 0;
}
);
return $rows;
However, this is returning an Array where otherwise 99% correct, includes cases like: 2017-03-28
, 2017-03-29
, 2017-04-01
, 2017-03-30
, 2017-04-02
, 2017-03-31
, 2017-04-03
and returns to normal sort. 然而,这将返回一个Array另有99%是正确的,包括像例:
2017-03-28
, 2017-03-29
, 2017-04-01
, 2017-03-30
, 2017-04-02
, 2017-03-31
, 2017-04-03
,并返回到正常的排序。
This is the returned Array to Google Charts: 这是返回给Google图表的数组:
Does anyone know why this would be happening? 有谁知道为什么会这样?
instead of sorting the array data, probably easier to sort the google data table before drawing... 而不是对数组数据进行排序,可能更容易在绘制之前对google数据表进行排序...
data.sort([{column: 0}]);
chart.draw(data);
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