# PHP無限分組
> 世界上最好的語言不是吹的，輕松實現一個令人嘆為觀止的無限級別分組列表。
~~~
/**
* group by any level
* http://blog.phpdr.net/php%E6%97%A0%E6%9E%81%E5%88%86%E7%BB%84.html
*
* @param array $list
* @param mixed $columns
* @param mixed $group
* @param mixed $primary
* @return array
*/
function dict(array $list, $columns = null, $group = null, $primary = null) {
if (! isset ( $primary )) {
$primary = array ();
}
if (is_string ( $primary )) {
$primary = array (
$primary
);
}
if (is_string ( $group )) {
$group = array (
$group
);
}
$listNew = array ();
foreach ( $list as $v ) {
$key = null;
foreach ( $primary as $v1 ) {
$key .= $v [$v1];
}
if (isset ( $columns )) {
if (is_array ( $columns ) && 1 === count ( $columns ) && $columns [0] === null) {
$vNew = null;
} else {
$vNew = array ();
if (is_array ( $columns )) {
foreach ( $columns as $k1 => $v1 ) {
if (is_int ( $k1 )) {
$k1 = $v1;
}
$vNew [$k1] = $v [$v1];
}
} else {
$vNew = $v [$columns];
}
}
} else {
$vNew = $v;
}
if (isset ( $group )) {
$vGroup = &$listNew;
foreach ( $group as $v2 ) {
if (isset ( $vGroup ) && array_key_exists ( $v [$v2], $vGroup )) {
$vGroup = &$vGroup [$v [$v2]];
} else {
$vGroup [$v [$v2]] = array ();
$vGroup = &$vGroup [$v [$v2]];
}
}
if (isset ( $key )) {
$vGroup [$key] = $vNew;
} else {
$vGroup [] = $vNew;
}
} else {
if (isset ( $key )) {
$listNew [$key] = $vNew;
} else {
$listNew [] = $vNew;
}
}
}
return $listNew;
}
$list = array ();
$list [] = array (
'id' => 1,
'name' => '學生1',
'school' => '學校1',
'class' => '班級1'
);
$list [] = array (
'id' => 4,
'name' => '學生4',
'school' => '學校2',
'class' => '班級2'
);
$list [] = array (
'id' => 2,
'name' => '學生2',
'school' => '學校1',
'class' => '班級2'
);
$list [] = array (
'id' => 3,
'name' => '學生3',
'school' => '學校2',
'class' => '班級1'
);
$list [] = array (
'id' => 5,
'name' => '學生5',
'school' => '學校2',
'class' => '班級3'
);
echo '<pre>';
print_r ( dict ( $list, 'name' ) );
var_dump ( dict ( $list, array (
null
) ) );
print_r ( dict ( $list, array (
'id',
'name',
'school'
), null, 'id' ) );
print_r ( dict ( $list, null, null, array (
'class',
'name'
) ) );
print_r ( dict ( $list, array (
'name'
), 'school', 'id' ) );
print_r ( dict ( $list, array (
'name'
), array (
'school',
'class'
), 'id' ) );
~~~
~~~
print_r ( dict ( $list, array (
'id',
'name',
'school'
), null, 'id' ) );
Array
(
[1] => Array
(
[id] => 1
[name] => 學生1
[school] => 學校1
)
[4] => Array
(
[id] => 4
[name] => 學生4
[school] => 學校2
)
[2] => Array
(
[id] => 2
[name] => 學生2
[school] => 學校1
)
[3] => Array
(
[id] => 3
[name] => 學生3
[school] => 學校2
)
[5] => Array
(
[id] => 5
[name] => 學生5
[school] => 學校2
)
)
~~~
~~~
print_r ( dict ( $list, null, null, array (
'class',
'name'
) ) );
Array
(
[班級1學生1] => Array
(
[id] => 1
[name] => 學生1
[school] => 學校1
[class] => 班級1
)
[班級2學生4] => Array
(
[id] => 4
[name] => 學生4
[school] => 學校2
[class] => 班級2
)
[班級2學生2] => Array
(
[id] => 2
[name] => 學生2
[school] => 學校1
[class] => 班級2
)
[班級1學生3] => Array
(
[id] => 3
[name] => 學生3
[school] => 學校2
[class] => 班級1
)
[班級3學生5] => Array
(
[id] => 5
[name] => 學生5
[school] => 學校2
[class] => 班級3
)
)
~~~
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