RecursiveTreeIterator
The RecursiveTreeIterator allows iterating over a RecursiveIterator to generate an ASCII graphic tree. This is a convenient and native way to display a tree-like structure.
<?php
$data = [
'fruit' => [
'apple',
'banana'
],
'vegetables' => [
'carrot',
'broccoli',
'leafy' => [
'spinach',
'lettuce'
]
]
];
// Wrap the array in a RecursiveArrayIterator
$iterator = new RecursiveArrayIterator($data);
// Create a RecursiveTreeIterator
$treeIterator = new RecursiveTreeIterator(
$iterator,
RecursiveTreeIterator::SELF_FIRST
);
// Loop and print the tree
foreach ($treeIterator as $key => $value) {
echo $treeIterator->getPrefix() . "$key: $value\n";
}
/**
|-- fruit
| |-- 0: apple
| |-- 1: banana
|-- vegetables
| |-- 0: carrot
| |-- 1: broccoli
| |-- leafy
| |-- 0: spinach
| |-- 1: lettuce
*/
?>