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@ 2021-01-25T21:04:59Z

<?php 

const URLS = [
    "http://site.com/",
    "http://site.com/save",
    "http://site.com/save/results",
    "http://site.com/save/results/path",
    "http://site.com/path/save/results",
    "http://site.com/save/path",
    "http://site.com/path/results",
    "http://site.com/Crawler4",
    "http://site.com/Crawler",
];

$siteStructure = [];

foreach (URLS as $url)
{
    // Parse the URL into components
    ['scheme' => $scheme, 'host' => $host, 'path' => $path] = parse_url($url);

    // build the slug for the top-level element
	$realm = $scheme . '://' . $host;

    // create the top levekl element and get a reference to it
    $siteStructure[$realm] = $siteStructure[$realm] ?? [];
    $current = &$siteStructure[$realm];

    // parse the path into parts
	$pathEls = preg_split('/[^a-zA-Z0-9]+/', $path, 0, PREG_SPLIT_NO_EMPTY);

	foreach ($pathEls as $el)
	{
	    // for each part, make sure the child array exists and overwrite the reference to the child
	    $current[$el] = $current[$el] ?? [];
	    $current = &$current[$el];
	}
	
	
	$current[0] = $url;

	// delete the reference at the end of the loop to prevent accidents
	unset($current);
}

var_dump($siteStructure);

Output for git.master, git.master_jit, rfc.property-hooks: array(1) { ["http://site.com"]=> array(5) { [0]=> string(16) "http://site.com/" ["save"]=> array(3) { [0]=> string(20) "http://site.com/save" ["results"]=> array(2) { [0]=> string(28) "http://site.com/save/results" ["path"]=> array(1) { [0]=> string(33) "http://site.com/save/results/path" } } ["path"]=> array(1) { [0]=> string(25) "http://site.com/save/path" } } ["path"]=> array(2) { ["save"]=> array(1) { ["results"]=> array(1) { [0]=> string(33) "http://site.com/path/save/results" } } ["results"]=> array(1) { [0]=> string(28) "http://site.com/path/results" } } ["Crawler4"]=> array(1) { [0]=> string(24) "http://site.com/Crawler4" } ["Crawler"]=> array(1) { [0]=> string(23) "http://site.com/Crawler" } } }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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