(PHP 5 >= 5.1.3, PHP 7, PHP 8)
RecursiveIteratorIterator::__construct — RecursiveIteratorIterator を作成する
$iterator, int $mode = RecursiveIteratorIterator::LEAVES_ONLY, int $flags = 0)RecursiveIterator から RecursiveIteratorIterator を作成します。
iterator作成する元となるイテレータ。 RecursiveIterator あるいは IteratorAggregate。
modeオプションのモード。これらの値が指定できます。
RecursiveIteratorIterator::LEAVES_ONLY
- デフォルト。イテレーションで葉ノードだけを取り上げます。
RecursiveIteratorIterator::SELF_FIRST
- イテレーションで葉と親を (親から先に) 取り上げます。
RecursiveIteratorIterator::CHILD_FIRST
- イテレーションで葉と親を (葉から先に) 取り上げます。
flags
オプションのフラグ。指定できる値は RecursiveIteratorIterator::CATCH_GET_CHILD
で、RecursiveIteratorIterator::getChildren() のコール時にスローされた例外を無視します。
例1 RecursiveIteratorIterator の反復処理
<?php
$array = array(
array(
array(
array(
'leaf-0-0-0-0',
'leaf-0-0-0-1'
),
'leaf-0-0-0'
),
array(
array(
'leaf-0-1-0-0',
'leaf-0-1-0-1'
),
'leaf-0-1-0'
),
'leaf-0-0'
)
);
$iterator = new RecursiveIteratorIterator(
new RecursiveArrayIterator($array),
$mode
);
foreach ($iterator as $key => $leaf) {
echo "$key => $leaf", PHP_EOL;
}
?>
$mode = RecursiveIteratorIterator::LEAVES_ONLY の場合の出力
0 => leaf-0-0-0-0 1 => leaf-0-0-0-1 0 => leaf-0-0-0 0 => leaf-0-1-0-0 1 => leaf-0-1-0-1 0 => leaf-0-1-0 0 => leaf-0-0
$mode = RecursiveIteratorIterator::SELF_FIRST の場合の出力
0 => Array 0 => Array 0 => Array 0 => leaf-0-0-0-0 1 => leaf-0-0-0-1 1 => leaf-0-0-0 1 => Array 0 => Array 0 => leaf-0-1-0-0 1 => leaf-0-1-0-1 1 => leaf-0-1-0 2 => leaf-0-0
$mode = RecursiveIteratorIterator::CHILD_FIRST の場合の出力
0 => leaf-0-0-0-0 1 => leaf-0-0-0-1 0 => Array 1 => leaf-0-0-0 0 => Array 0 => leaf-0-1-0-0 1 => leaf-0-1-0-1 0 => Array 1 => leaf-0-1-0 1 => Array 2 => leaf-0-0 0 => Array
Note: the missing documentation of the argument list for this constructor is currently as follows (according to source code).
Param iter: see RecursiveIterator
Param mode:
- LEAVES_ONLY = (default) only iterate leaves
- SELF_FIRST = iterate parents prior to children
- CHILD_FIRST = iterate children prior to parents
Param flags:
- CATCH_GET_CHILD = ignore exceptions in getChildren() callNote that LEAVES_ONLY, SELF_FIRST and CHILD_FIRST do not work by themselves.
They are class constants so you need to use RecursiveIteratorIterator::LEAVES_ONLY, etc.