[英]Regroup array to tree structure in PHP
我有一個像這樣的數組:
$array = array(
array('id' => 'foo.bar'),
array('id' => 'foo'),
array('id' => 'foo.baz.bar'),
array('id' => 'foo.bar.bar'),
);
我可以split
id
字段split
為路徑,然后將它們排序為樹...
$result = array();
foreach($array as $element) {
$path = explode('.', $element['id']);
$subtree = $result;
while(!empty($path)) {
$path_element = array_shift($path);
if(empty($path_element)) {
$subtree['data'] = $element;
} else {
if(!is_array($subtree[$path_element])) {
$subtree[$path_element] = array();
}
$subtree = $subtree[$path_element];
}
}
}
但是我得到的只是大量警告和一個空的$res
-Array。
PHP Notice: Undefined index: foo in tree.php on line 24
PHP Stack trace:
PHP 1. {main}() tree.php:0
PHP Notice: Undefined index: bar in tree.php on line 24
PHP Stack trace:
PHP 1. {main}() tree.php:0
PHP Notice: Undefined index: foo in tree.php on line 24
PHP Stack trace:
PHP 1. {main}() tree.php:0
PHP Notice: Undefined index: foo in tree.php on line 24
PHP Stack trace:
PHP 1. {main}() tree.php:0
PHP Notice: Undefined index: baz in tree.php on line 24
PHP Stack trace:
PHP 1. {main}() tree.php:0
PHP Notice: Undefined index: bar in tree.php on line 24
PHP Stack trace:
PHP 1. {main}() tree.php:0
PHP Notice: Undefined index: foo in tree.php on line 24
PHP Stack trace:
PHP 1. {main}() tree.php:0
PHP Notice: Undefined index: bar in tree.php on line 24
PHP Stack trace:
PHP 1. {main}() tree.php:0
PHP Notice: Undefined index: bar in tree.php on line 24
PHP Stack trace:
PHP 1. {main}() tree.php:0
(第24行是$s = $s[$pe];
)
有什么提示嗎?
編輯 :我想要的輸出將是這樣
$res = array(
'foo' => array(
'data' => ...
'bar' => array(
'data' => ...
'bar' => array(
'data' => ...
),
),
'baz' => array(
'bar' => array(
'data' => ...
),
),
),
);
data
元素是數組中的原始元素。
下面的代碼生成以下結果:
Array
(
[foo] => Array
(
[data] => ...
[baz] => Array
(
[bar] => Array
(
[data] => ...
)
)
[bar] => Array
(
[bar] => Array
(
[data] => ...
)
)
)
)
我重命名了一些變量...
$array = array(
array('id' => 'foo.bar'),
array('id' => 'foo'),
array('id' => 'foo.baz.bar'),
array('id' => 'foo.bar.bar'),
);
$res = array();
foreach($array as $e) {
$parts = explode('.', $e['id']);
$temp = &$res;
foreach($parts as $key => $el) {
if (!isset($temp[$el])) $temp[$el] = array();
if ($key == count($parts)-1) $temp[$el] = array('data' => '...');
$temp = &$temp[$el];
}
}
print_r($res);
使用&
使$ s引用$ res。 這將通過引用而不是通過值傳遞數據。
$a = array(
array('id' => 'foo.bar'),
array('id' => 'foo'),
array('id' => 'foo.baz.bar'),
array('id' => 'foo.bar.bar'),
);
$res = array();
foreach($a as $e) {
$p = explode('.', $e['id']);
$s = &$res;
while(!empty($p)) {
$pe = array_shift($p);
if(empty($p)) {
$s['data'] = $e;
} else {
if(!isset($s[$pe])) {
$s[$pe] = array();
}
$s = &$s[$pe];
}
}
}
echo '<pre>';
print_r($res);
echo '</pre>';
結果是
Array
(
[foo] => Array
(
[data] => Array
(
[id] => foo.bar
)
[baz] => Array
(
[data] => Array
(
[id] => foo.baz.bar
)
)
[bar] => Array
(
[data] => Array
(
[id] => foo.bar.bar
)
)
)
[data] => Array
(
[id] => foo
)
)
遞歸是您的答案。
並且您需要以下方面的東西:
<?php
$a = array(
array('id' => 'foo.bar'),
array('id' => 'foo'),
array('id' => 'foo.baz.bar'),
array('id' => 'foo.bar.bar'),
);
function createTree($path) {
if ( count($path) === 1 ) {
return array($path[0]=>array('data'=>'some random data here'));
} else {
$currentRoot = array_shift($path);
return array($currentRoot => createTree($path));
}
}
$result = array();
foreach ( $a as $item ) {
$result = array_merge_recursive(
$result,
createTree(
explode('.',$item['id'])
)
);
}
// $result now is what you wanted
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