Longhorn PHP 2019 Schedule

RecursiveIteratorIterator::__construct

(PHP 5 >= 5.1.3, PHP 7)

RecursiveIteratorIterator::__constructRecursiveIteratorIterator を作成する

説明

public RecursiveIteratorIterator::__construct ( Traversable $iterator [, int $mode = RecursiveIteratorIterator::LEAVES_ONLY [, int $flags = 0 ]] )

RecursiveIterator から RecursiveIteratorIterator を作成します。

パラメータ

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。

返り値

値を返しません。

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

add a note add a note

User Contributed Notes 2 notes

up
1
Tom
8 years ago
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() call
up
0
Matt Creenan
8 years ago
Note 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.
To Top