PHP:通过字符串动态获取嵌套的Optgroup和选项

Question

从字符串数组开始，如:

"mobili;tavolini_lato_divano",
"mobili;tavoli_da_pranzo",
"illuminazione;plafoniere",
"illuminazione;lampade_decorative",
"sculture;sculture_in_resina",
"sculture;sculture_in_resina;serie_limitata_tatoo",
"sculture;sculture_in_resina;sculture_resina_grandi",

需要创建一个有嵌套的optgroup和option的select，基于";";，如果有两个元素，第一个(父)成为optgroup，第二个(子)成为option。

如果有3个元素(第一个元素相同)，第二个元素将成为一个optiongroup(在第一个optgroup内-嵌套-)，并在一个选项(3d元素)内。

如果有4个元素，则依次类推。

实际上我做了这个例子，但这只适用于有2个计数

完整的输入和输出示例:

https://wtools.io/php-sandbox/b63q

选择Execute和HTML作为输出来查看结果。

感谢

Answer 1

首先创建元素数组的有序(和嵌套)数组(第76-89行，在我的代码)，然后必须使用递归函数(我的代码中的第91-104行)

最后，打印递归函数的输出(我的代码中的第107行)) .

<?php
/*
Row 1 : mobiletti_puzzle_3d;mobili
Output : "optgroup" -> mobiletti_puzzle_3d
"option" -> mobili
Row 2 : sculture;sculture_in_resina
Output : "optgroup" -> sculture
"option" -> sculture_in_resina
Row 3 : sculture;sculture_in_resina;sculture_resina_grandi
Output : "optgroup" -> sculture
"optgroup" -> sculture_in_resina
"option" -> sculture_resina_grandi
If they have the same parent must be added as Option of Row 2 
Row 4 : sculture;sculture_in_metallo
Output : "optgroup" -> sculture
"option" -> sculture_in_metallo

Final Output ALL EXAMPLE :
"optgroup" -> mobiletti_puzzle_3d
"option" -> mobili
"optgroup" -> sculture
"option" -> sculture_in_resina
"option" -> sculture_in_metallo
"optgroup" -> sculture_in_resina
"option" -> sculture_resina_grandi
Split by " ; " the count-1 , always will be an optgroup and this will generate a Nested Optgroup 
*/
$Categories = [
"mobiletti_puzzle_3d;mobili",
"mobili;sedie_da_pranzo",
"mobili;sgabelli",
"mobili;tavolini_da_salotto",
"mobili;tavolini_lato_divano",
"mobili;tavoli_da_pranzo",
"sculture;sculture_decorate_in_vetro",
"sculture;sculture_in_bronzo",
"sculture;sculture_in_metallo",
"sculture;sculture_in_resina;sculture_resina_grandi",
"sculture;sculture_in_resina;sculture_resina_medie",
"sculture;sculture_in_resina;sculture_resina_piccole",
"sculture;sculture_in_resina;serie_limitata_tatoo",
"illuminazione;plafoniere",
"illuminazione;lampade_decorative",
"illuminazione;lampade_da_terra",
"illuminazione;lampade_da_tavolo",
"illuminazione;lampade_da_comodino",
"illuminazione;lampadari",
"divani_e_poltrone;mobili",
"decorazione_murale;stampe_su_telaio_estetico",
"decorazione_murale;specchi_design_moderno",
"decorazione_murale;quadri_scultura_in_metallo",
"decorazione_murale;puzzle_3d_in_legno",
"decorazione_murale;orologi_parete",
"decorazione_murale;dipinti_su_telaio_estetico",
"decorazione_murale;dipinti_su_plexiglas",
"consolle;mobili",
"colonne;mobili",
"collage_3d;decorazione_murale",
"appliques;illuminazione",
"altri_oggetti;vasi",
"altri_oggetti;posacenere",
"altri_oggetti;portagioie",
"altri_oggetti;portacandele",
"altri_oggetti;oggetti_decorativi",
"altri_oggetti;centrotavola"
];
$select = [];
foreach ($Categories as $row) {
$pointer = &$select;
$row = explode(';', $row);
$ogCount = count($row) - 1;
for ($i = 0; $i < $ogCount; $i++) {
$row[$i] = $row[$i];
if (empty($pointer[$row[$i]]))
$pointer[$row[$i]] = [];
$pointer = &$pointer[$row[$i]];
if (($i + 1) >= $ogCount)
$pointer[] = $row[$i + 1];
}
}
function recursiveSelect($_options, $_space = '')
{
if (!is_array($_options))
return  '<option value="' . $_options . '">' . $_options . '</option>' . "n";
else {
$tmp = '';
foreach ($_options as $key => $option)
if (!is_array($option)) {
$tmp .= recursiveSelect($option);
} else
$tmp .= '<optgroup label="' . $_space . $key . '">' . recursiveSelect($option, $_space . str_repeat('&nbsp;', 4)) . '</optgroup>' . "n";
return $tmp;
}
}
?>
<select>
<?php echo (recursiveSelect($select)); ?>
</select>

此代码可以处理数组中嵌套元素的所有深度。

为了更好地显示所选择的optgroups，我在递归函数中添加了space ($_space)参数(第101行有4个空格)。