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@ 2019-06-08T11:10:46Z

<?php

$arr = array (
  0 => 'FOLDER./Images.Vacation.2018',
  1 => './Images.Vacation.2018/Racoon001.jpg',
  2 => './Images.Vacation.2018/Racoon002.txt',
  3 => './Images.Vacation.2018/the.racoon.swimming.mp4',
  4 => './Images.Vacation.2018/the.racoon.swimming.slv',
  5 => 'FOLDER./WestImages',
  6 => './WestImages/Ramco.txt',
  7 => './WestImages/Ramco.jpg',
  8 => 'FOLDER./WestImages/Subimages',
  9 => './WestImages/Subimages/Image001.jpg',
  10 => './WestImages/Subimages/Image002.jpg',
  11 => './WestImages/West.Ramco.Swimming.mp4',
);

$folders = preg_grep("/^FOLDER.*/", $arr);

foreach($folders as $folder){
    $result[] = $folder;
    $result = array_merge($result, preg_grep("/^\." . str_replace(["FOLDER.", "/"], ["","\/"], $folder) . "\/[A-Za-z0-9\.]+$/", $arr));
}

var_dump($result);

Output for git.master, git.master_jit, rfc.property-hooks: array(12) { [0]=> string(28) "FOLDER./Images.Vacation.2018" [1]=> string(36) "./Images.Vacation.2018/Racoon001.jpg" [2]=> string(36) "./Images.Vacation.2018/Racoon002.txt" [3]=> string(46) "./Images.Vacation.2018/the.racoon.swimming.mp4" [4]=> string(46) "./Images.Vacation.2018/the.racoon.swimming.slv" [5]=> string(18) "FOLDER./WestImages" [6]=> string(22) "./WestImages/Ramco.txt" [7]=> string(22) "./WestImages/Ramco.jpg" [8]=> string(36) "./WestImages/West.Ramco.Swimming.mp4" [9]=> string(28) "FOLDER./WestImages/Subimages" [10]=> string(35) "./WestImages/Subimages/Image001.jpg" [11]=> string(35) "./WestImages/Subimages/Image002.jpg" }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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