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@ 2021-07-14T14:02:29Z

<?php

$string = "\tA\t B \tC \t D ";

var_export(
    [
        'input' => $string,
        'space, no flag' => preg_split('~ +~', $string),
        'space, flag'    => preg_split('~ +~', $string, -1, PREG_SPLIT_NO_EMPTY),
        'tab, no flag' => preg_split('~\t+~', $string),
        'tab, flag'    => preg_split('~\t+~', $string, -1, PREG_SPLIT_NO_EMPTY),
        'whitespace, no flag' => preg_split('~\s+~', $string),
        'whitespace, flag'    => preg_split('~\s+~', $string, -1, PREG_SPLIT_NO_EMPTY),
        'tab&space, no flag' => preg_split('~[\t ]+~', $string),
        'tab&space, flag' => preg_split('~[\t ]+~', $string, -1, PREG_SPLIT_NO_EMPTY),
        'horizontal whitespace, no flag' => preg_split('~\h+~', $string),
        'horizontal whitespace, flag' => preg_split('~\h+~', $string, -1, PREG_SPLIT_NO_EMPTY),
    ]
);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 'input' => ' A B C D ', 'space, no flag' => array ( 0 => ' A ', 1 => 'B', 2 => ' C', 3 => ' ', 4 => 'D', 5 => '', ), 'space, flag' => array ( 0 => ' A ', 1 => 'B', 2 => ' C', 3 => ' ', 4 => 'D', ), 'tab, no flag' => array ( 0 => '', 1 => 'A', 2 => ' B ', 3 => 'C ', 4 => ' D ', ), 'tab, flag' => array ( 0 => 'A', 1 => ' B ', 2 => 'C ', 3 => ' D ', ), 'whitespace, no flag' => array ( 0 => '', 1 => 'A', 2 => 'B', 3 => 'C', 4 => 'D', 5 => '', ), 'whitespace, flag' => array ( 0 => 'A', 1 => 'B', 2 => 'C', 3 => 'D', ), 'tab&space, no flag' => array ( 0 => '', 1 => 'A', 2 => 'B', 3 => 'C', 4 => 'D', 5 => '', ), 'tab&space, flag' => array ( 0 => 'A', 1 => 'B', 2 => 'C', 3 => 'D', ), 'horizontal whitespace, no flag' => array ( 0 => '', 1 => 'A', 2 => 'B', 3 => 'C', 4 => 'D', 5 => '', ), 'horizontal whitespace, flag' => array ( 0 => 'A', 1 => 'B', 2 => 'C', 3 => 'D', ), )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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