php 如何将相同的数组值分组
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How do I group same array value
提问by Unknown Error
Example my array
以我的数组为例
$options = array(
array("brand" => "Puma","code" => "p01","name" => "Puma One"),
array("brand" => "Puma","code" => "p02","name" => "Puma Two"),
array("brand" => "Puma","code" => "p03","name" => "Puma Three"),
array("brand" => "Nike","code" => "n01","name" => "Nike One"),
array("brand" => "Nike","code" => "n02","name" => "Nike Two"),
array("brand" => "Nike","code" => "n03","name" => "Nike Three"),
array("brand" => "Nike","code" => "n04","name" => "Nike Four"),
array("brand" => "Adidas","code" => "a01","name" => "Adidas One"),
array("brand" => "Adidas","code" => "a02","name" => "Adidas Two"),
array("brand" => "Adidas","code" => "a03","name" => "Adidas Three"),
array("brand" => "Adidas","code" => "a04","name" => "Adidas Four"),
array("brand" => "Adidas","code" => "a05","name" => "Adidas Five"),
array("brand" => "Adidas","code" => "a06","name" => "Adidas Six")
);
How to generate this array to be
如何生成这个数组
<select name="products" id="products">
<optgroup label="Puma">
<option value="p01">Puma One</option>
<option value="p02">Puma Two</option>
<option value="p03">Puma Three</option>
</optgroup>
.......
<optgroup label="Adidas">
<option value="a01">Adidas One</option>
<option value="a02">Adidas Two</option>
<option value="a03">Adidas Three</option>
.......
</optgroup>
</select>
Or you can suggestion better array according to my select option output. Let me know.
或者您可以根据我的选择选项输出建议更好的数组。让我知道。
回答by casablanca
You can create another array keyed by the brand:
您可以创建另一个以品牌为键的数组：
$newOptions = array();
foreach ($options as $option) {
$brand = $option['brand'];
$code = $option['code'];
$name = $option['name'];
$newOptions[$brand][$code] = $name;
}
This will produce an array like this:
这将产生一个像这样的数组：
$newOptions = array(
'Puma' => array('p01' => 'Puma One', 'p02' => 'Puma Two'),
'Nike' => array('n01' => 'Nike One', 'n02' => 'Nike Two'),
...
);
If you can directly format your array like this, you can skip the first step.
如果您可以像这样直接格式化数组，则可以跳过第一步。
Then iterate over this new array and output the options:
然后迭代这个新数组并输出选项：
foreach ($newOptions as $brand => $list) {
echo "<optgroup label=\"$brand\">\n";
foreach ($list as $code => $name)
echo "<option value=\"$code\">$name</option>\n";
echo "</optgroup>\n";
}
