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This document uses PHP Chinese website manual Release
(PHP 5 >= 5.1.3)
RecursiveIteratorIterator::__construct — Construct a RecursiveIteratorIterator
$iterator
[, int $mode
= RecursiveIteratorIterator::LEAVES_ONLY
[, int $flags
= 0
]] )Creates a RecursiveIteratorIterator from a RecursiveIterator.
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() .
没有返回值。
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
[#1] Tom [2011-01-06 01:13:20]
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
[#2] Matt Creenan [2010-03-05 09:39:45]
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.