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Construct a RecursiveIteratorIterator


RecursiveIteratorIterator::__construct

(PHP 5 >= 5.1.3)

RecursiveIteratorIterator::__constructConstruct a RecursiveIteratorIterator

Description

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

Creates a RecursiveIteratorIterator from a RecursiveIterator.

Parameters

iterator

The iterator being constructed from. Either a RecursiveIterator or IteratorAggregate.

mode

Optional mode. Possible values are

  • RecursiveIteratorIterator::LEAVES_ONLY - The default. Lists only leaves in iteration.
  • RecursiveIteratorIterator::SELF_FIRST - Lists leaves and parents in iteration with parents coming first.
  • RecursiveIteratorIterator::CHILD_FIRST - Lists leaves and parents in iteration with leaves coming first.

flags

Optional flag. Possible values are RecursiveIteratorIterator::CATCH_GET_CHILD which will then ignore exceptions thrown in calls to RecursiveIteratorIterator::getChildren().

Return Values

No value is returned.

Examples

Example #1 Iterating a RecursiveIteratorIterator

<?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;
}
?>

Output with $mode = RecursiveIteratorIterator::LEAVES_ONLY

 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 

Output with $mode = RecursiveIteratorIterator::SELF_FIRST

 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 

Output with $mode = RecursiveIteratorIterator::CHILD_FIRST

 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 



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