在将PHP版本从5.5更改为7.0后，我遇到了Magento 1.8的奇怪行为。
这种奇怪的行为是由于工作函数uasort发生了变化。
源代码：
<?php
$arr = [
"nominal" => [
"before" => ["subtotal", "grand_total"],
"after" => [],
"_code" => "nominal"
],
"subtotal" => [
"after" => ["nominal"],
"before" => ["grand_total", "shipping", "freeshipping", "tax_subtotal", "discount", "tax", "weee"],
"_code" => "subtotal"
],
"shipping" => [
"after" => ["subtotal", "freeshipping", "tax_subtotal", "nominal", "weee"],
"before" => ["grand_total", "discount", "tax_shipping", "tax"],
"_code" => "shipping"
],
"grand_total" => [
"after" => ["subtotal", "nominal", "shipping", "freeshipping", "tax_subtotal", "discount", "tax"],
"before" => [],
"_code" => "grand_total"
],
"msrp" => [
"before" => [],
"after" => [],
"_code" => "msrp"
],
"freeshipping" => [
"after" => ["subtotal", "nominal"],
"before" => ["tax_subtotal", "shipping", "grand_total", "tax", "discount"],
"_code" => "freeshipping"
],
"discount" => [
"after" => ["subtotal", "shipping", "nominal", "freeshipping", "tax_subtotal", "tax_shipping", "weee"],
"before" => ["grand_total", "tax"],
"_code" => "discount"
],
"tax_subtotal" => [
"after" => ["0" => "freeshipping", "1" => "subtotal", "3" => "nominal"],
"before" => ["tax", "discount", "shipping", "grand_total", "tax_shipping", "weee"],
"_code" => "tax_subtotal"
],
"tax_shipping" => [
"after" => ["shipping", "tax_subtotal", "subtotal", "freeshipping", "nominal"],
"before" => ["tax", "discount", "grand_total"],
"_code" => "tax_shipping"
],
"tax" => [
"after" => ["subtotal", "shipping", "discount", "tax_subtotal", "freeshipping", "tax_shipping", "nominal", "weee"],
"before" => ["grand_total"],
"_code" => "tax"
],
"weee" => [
"after" => ["subtotal", "tax_subtotal", "nominal", "freeshipping"],
"before" => ["shipping", "tax", "discount", "grand_total", "tax_shipping"],
"_code" => "weee"
]
];
function _compareTotals($a, $b)
{
$aCode = $a['_code'];
$bCode = $b['_code'];
if (in_array($aCode, $b['after']) || in_array($bCode, $a['before'])) {
$res = -1;
} elseif (in_array($bCode, $a['after']) || in_array($aCode, $b['before'])) {
$res = 1;
} else {
$res = 0;
}
echo sprintf("%s <> %s: %s", $aCode, $bCode, $res) . "\n";
return $res;
}
uasort($arr, '_compareTotals');
var_dump(array_keys($arr));
在php 5.5中，结果是：
freeshipping <> subtotal: 1
freeshipping <> shipping: -1
weee <> freeshipping: 1
tax <> freeshipping: 1
tax_shipping <> freeshipping: 1
tax_subtotal <> freeshipping: 1
discount <> freeshipping: 1
nominal <> freeshipping: -1
freeshipping <> grand_total: -1
msrp <> freeshipping: 0
subtotal <> msrp: 0
nominal <> subtotal: -1
tax_subtotal <> shipping: -1
weee <> tax_subtotal: 1
tax <> tax_subtotal: 1
tax_shipping <> tax_subtotal: 1
grand_total <> tax_subtotal: 1
discount <> tax_subtotal: 1
shipping <> tax_subtotal: 1
grand_total <> discount: 1
grand_total <> shipping: 1
grand_total <> tax_shipping: 1
grand_total <> tax: 1
weee <> grand_total: -1
shipping <> discount: -1
tax <> shipping: 1
tax_shipping <> shipping: 1
weee <> shipping: -1
tax_shipping <> discount: -1
tax <> tax_shipping: 1
discount <> tax_shipping: 1
tax <> discount: 1
array(11) {
[0] =>
string(7) "nominal"
[1] =>
string(8) "subtotal"
[2] =>
string(4) "msrp"
[3] =>
string(12) "freeshipping"
[4] =>
string(12) "tax_subtotal"
[5] =>
string(4) "weee"
[6] =>
string(8) "shipping"
[7] =>
string(12) "tax_shipping"
[8] =>
string(8) "discount"
[9] =>
string(3) "tax"
[10] =>
string(11) "grand_total"
}
在php 7.0中，结果是：
nominal <> subtotal: -1
subtotal <> shipping: -1
shipping <> grand_total: -1
grand_total <> msrp: 0
msrp <> freeshipping: 0
freeshipping <> discount: -1
discount <> tax_subtotal: 1
msrp <> tax_subtotal: 0
freeshipping <> tax_subtotal: -1
discount <> tax_shipping: 1
freeshipping <> tax_shipping: -1
tax_subtotal <> tax_shipping: -1
discount <> tax: -1
tax <> weee: 1
tax_shipping <> weee: 1
freeshipping <> weee: -1
tax_subtotal <> weee: -1
array(11) {
[0] =>
string(7) "nominal"
[1] =>
string(8) "subtotal"
[2] =>
string(8) "shipping"
[3] =>
string(11) "grand_total"
[4] =>
string(4) "msrp"
[5] =>
string(12) "freeshipping"
[6] =>
string(12) "tax_subtotal"
[7] =>
string(4) "weee"
[8] =>
string(12) "tax_shipping"
[9] =>
string(8) "discount"
[10] =>
string(3) "tax"
}
在PHP5中grand_total是最后一个元素，但在PHP7中 - 没有。
问题与位置msrp元素的不确定性有关。我在php 5上找到了关于这个主题的research。
我通过指示相对位置msrp解决了这个问题。但我想知道为什么它在php5中工作，并且在php7中不起作用。这些是新版本的php或bug的功能吗？
添加＃1
问题不仅在于PHP7不知道如何对相等元素进行排序，例如msrp和grand_total。
如果您查看项shipping和freeshipping，那么它们就会明确定义，谁应该更早。 PHP5解决了这个问题，PHP7没有。
答案 0 :(得分：12)
来自usort()文档：
注意：如果两个成员比较相等，则排序数组中的相对顺序是未定义的。
这就是你在这里看到的。 PHP 7使用不同的，部分稳定的排序算法，因此根据您的排序函数进行比较的元素现在可能具有不同的顺序。
如果你关心相等元素的排序顺序（这不仅仅是一个测试问题），你应该在比较函数中明确它。
答案 1 :(得分：4)
我已经创建了一个magento模块，用于解决php7的总计算的magento问题。 我特别经历的问题是，在amazonpayments结帐页面上，Here is a link模块的税金已经增加了两倍。
pay with amazon archigrafix提供的解决方案解决了我的问题 - 所以这只是修补程序包装到模块中。
答案 2 :(得分：0)
为了在 PHP7 中工作，你只需要这样调用函数：
uasort($result, function ($a, $b) {
your_sort_function($a, $b); //call your sort function here
});
所以修改你的代码如下：
function _compareTotals($a, $b)
{
$aCode = $a['_code'];
$bCode = $b['_code'];
if (in_array($aCode, $b['after']) || in_array($bCode, $a['before'])) {
$res = -1;
} elseif (in_array($bCode, $a['after']) || in_array($aCode, $b['before'])) {
$res = 1;
} else {
$res = 0;
}
echo sprintf("%s <> %s: %s", $aCode, $bCode, $res) . "\n";
return $res;
}
uasort($arr, function($a, $b) {
_compareTotals($a, $b);
});
var_dump(array_keys($arr));