(PHP 5 >= 5.1.3, PHP 7)
RecursiveIteratorIterator::__construct — Construct a RecursiveIteratorIterator
$iterator
[, int $mode = RecursiveIteratorIterator::LEAVES_ONLY
[, int $flags = 0
]] )Creates a RecursiveIteratorIterator from a RecursiveIterator.
iteratorThe iterator being constructed from. Either a RecursiveIterator or IteratorAggregate.
modeOptional 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
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
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.