我的第一个帖子在这里。 PHP的新手，我有一部分需要做。制作一个网页，其中可以使用连接的条形码扫描仪将零件快速扫描成阵列。
<form id="results" action="launchresults.php" method="post"></form>
<form id="partslist" action='' method='post'></form>
<input type="text" name="partlist" id="partlist" form="partslist" />
<input type="submit" name='additem' value="Add Item" form="partslist" />
<input type="submit" name="clear" value="clear" form="partslist" />
<?php if (isset($_POST['additem'])) {
if(!array_key_exists("parts", $_SESSION)) {
$_SESSION["parts"] = array();
}
if(array_key_exists("parts", $_SESSION) && array_key_exists($_POST['partlist'],$_SESSION["parts"])) {
$increasevalue = $_SESSION["parts"][$_POST['partlist']]['quantity'];
$_SESSION["parts"][$_POST['partlist']]['quantity'] = $increasevalue+1;
}
else {
$_SESSION["parts"][$_POST['partlist']] = array("quantity" => 1);
}
}
if(isset($_POST['clear'])) {
$_SESSION = array();
}
if(array_key_exists("parts", $_SESSION)):
foreach ($_SESSION["parts"] as $partlist => $partlist_quantity):
foreach ($partlist_quantity as $key => $value): ?>
<input type="text" name="items[]" value="<?php echo $partlist; ?>" />
<input type="number" name="quantity" value="<?php echo $value; ?>" />
<?php endforeach; ?>
<?php endforeach; ?>
<?php endif; ?>
<input type="submit" name="submit" form="results" />
我可以扫描零件条形码以构建阵列。如果零件是我已经扫描过的零件，它将使数量增加1。输入字段是可编辑的，但是代码当前不允许手动更新这些字段。当我单击“提交”时，我将得到如下结果：
Array
(
[parts] => Array
(
[12345] => Array
(
[quantity] => 6
)
[errrt] => Array
(
[quantity] => 2
)
[ffggg] => Array
(
[quantity] => 4
)
[wefewf] => Array
(
[quantity] => 10
)
)
)
我现在要弄清楚的是如何找到关键零件，查看零件的数量，然后按该值将所有零件划分为相等的数组。因此，上面的主要部分是“ errrt”，那么我想将所有内容都除以2，最后得到类似下面的内容...
Array
(
[errrt1] => Array
(
[12345] => Array
(
[quantity] => 3
)
[ffggg] => Array
(
[quantity] => 2
)
[wefewf] => Array
(
[quantity] => 5
)
)
[errrt2] => Array
(
[12345] => Array
(
[quantity] => 3
)
[ffggg] => Array
(
[quantity] => 2
)
[wefewf] => Array
(
[quantity] => 5
)
)
)
这显然需要任何数量的工作。如果输入的所有部分均未根据键值均分，我将需要生成错误。
答案 0 :(得分：1)
赞：
$a = array (
'parts' =>
array (
12345 =>
array (
'quantity' => 6
),
'errrt' =>
array (
'quantity' => 2
),
'ffggg' =>
array (
'quantity' => 4
),
'wefewf' =>
array (
'quantity' => 10
)
)
);
$choice = 'errrt';
//localize
$parts = $a['parts'];
//localize chosen
$qty_chosen = isset($parts[$choice], $parts[$choice]['quantity']) ? $parts[$choice]['quantity'] : 0;
if(!$qty_chosen) die('Cannot divide by 0');
unset($parts[$choice]); //remove it
array_walk_recursive($parts, function(&$item)use($qty_chosen){
$item = $item / $qty_chosen;
});
$result = [];
for($i=1;$i<=$qty_chosen; ++$i){
$result[$choice.$i] = $parts;
}
print_r($result);
输出
Array
(
[errrt1] => Array
(
[12345] => Array
(
[quantity] => 3
)
[ffggg] => Array
(
[quantity] => 2
)
[wefewf] => Array
(
[quantity] => 5
)
)
[errrt2] => Array
(
[12345] => Array
(
[quantity] => 3
)
[ffggg] => Array
(
[quantity] => 2
)
[wefewf] => Array
(
[quantity] => 5
)
)
)
在这种情况下，我们可以简单地使用array_walk_recursive来划分嵌套数量，但是如果数组中还有其他元素，您将无法做到这一点。
如果您还有其他元素可以使用（代替array_walk_recursive）：
$parts = array_map(function($item)use($qty_chosen){
$item['quantity'] = $item['quantity'] / $qty_chosen;
return $item;
}, $parts);
或
array_walk($parts, function(&$item)use($qty_chosen){
$item['quantity'] = $item['quantity'] / $qty_chosen;
});
区别在于array_walk是2中更“神奇的”，因为它并不是真正用来更新数组的，而array_map是专门为实现此目的而设计的。我们可以使用array_walk_*函数来做到这一点，但是我们必须通过引用$item来传递&（这是另一堂课）。
在这种情况下，我个人更喜欢array_map，因为它更具可读性。如果您想变得特别（或感到特别懒惰），可以这样划分：
$item['quantity'] /= $qty_chosen;
哪种有点像.=或+=等。我从不使用它，我想我没有做足够的划分来真正考虑一下...？
无论如何，希望对您有所帮助。
答案 1 :(得分：0)
$array = ['parts' => [
'12345' => ['quantity' => 6],
'errrt' => ['quantity' => 2],
'ffggg' => ['quantity' => 4],
'wefewf' => ['quantity' => 10],
]];
// i don't know how you determine the main part, but that's your cup of tea ;o)
$mainpart = 'errrt';
// fetching quantity of the main part:
$divider = $array['parts'][$mainpart]['quantity'];
// create the sub part, since they are all identical,
// we make a sample "pattern", called "divided"
// (you could change the original array instead,
// but I chose to leave it unchanged)
$divided = [];
foreach($array['parts'] as $partname => $part) {
// the main part is not part of the pattern
if($partname == $mainpart) {
continue;
}
// if the quantity of the part is not dividable by
// main part quantity, abort or whatever
if($part['quantity'] % $divider != 0) {
// echo error message or throw Exception or whatever
// optionally set some flag and break;
throw new Exception('part '.$partname.' has quantity that cannot be divided by '.$divider);
}
// fix the quantity.
$part['quantity'] = $part['quantity'] / $divider;
// add the part to the pattern.
$divided[$partname] = $part;
}
$result = [];
// expand the pattern
for($i = 1; $i <= $divider; $i++) {
$result[$mainpart.$i] = $divided;
}
var_export($result);